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TAR jtlEEto JHU& Vol. 10, UNIVERSITY OF NORTH CAROLINA, CHAPEL HILL, 8. C, February 21, 1902. No. 18. THE OFFICIAL ORGAN OF THE UNIVERSITY ATHLETIC ASSOCIATION. ' . TENDING PROBLEMS HYGIENE. IN Lecture by Dr. Paul Barriagerof the University of Varginia. On last FridaV evening-, in the College Chapel, Dr. Paul Barringer, Chairman of the B acuity of the University of Virginia, lectured to the students on "Some Pending- Problems in Hygiene." His lecture was most interesting- .and instruct ive, and it was appreciated and en joyed by all who availed themselves of the opportunity of hearing- this distinguished son of Carolina. In speaking- of the wonderful ad vances that have recently been made in the medical profession Dr. Bar ringer said that the causes of such diseases as typhoid, tuberculosis, diptheria, etc. are now known and if we continue to have them the fault is our own. Cancer, however, still remains a terror, having- in creased one hundred per cent in the last fiftv years. It remains to be v learned whether this is caused by living" organisms or whether it has a chemical origin In veterinary medicine the first protozoa were discovered in the cattle of Texas, and upon investigation it was found that they were caused by a tick Remove the tick and you remove the fever. Dr. Lincoln of Washington, D. C once said iu a half joking way that the mosquito was the cause of mala ria. Recent discoveries have proved the truth of this statement and it is now known that mosquitoes do carry malaria and that this is the only way in which yellow fever is carried from patient to patient. In the Cuban hospitals yellow fever patients are placed beside those suffering from other troubles separated from them only by mos quito screens. Not all kinds of mosquitoes carry malaria. The common culex does not. There are three speeies of malarial mosquito in- America. They may be known by the spots on their wings. They do not breed as the ordinary mosquito but require water on the ground. How does the mosauito carrv malaria? It re- J. mf quires about twelve days, after the mosquito has bitten the yellow fever patient, for the protoplasmic ele ments to develop in the mosquito and get to the salivary gland from which they are injected into the body when the mosquito bites. The time, however, required for the de velopment of these protoplasmic ele ments depends upon the warmth of the climate. It requires only 10 or 12 days in summer, whereas 25 or 30 days may be required in winter. If in the -ummer time the mosquito bites a yellow fever patient and then sixteen days later bites an im mune, that one is sure to have yel low tever. There is no other way in which yellow fever is carried from patient to patient. Dr. Ried, a classmate of Dr. Venable's at the University of Virginia, has made remarkable discoveries in yellow fever and thrown long-needed light on this line of study. For his great tro-magnetic theory of light. A of geometry constructed in the last few centuries, one in especial the Geomotry of Position set up and constructed in the 19th Century is of pecular interest. The geometry of the ancients is in essence metrical; the Geometry of Position description, lacked gen- work in Cuba President McKinley part of this theory is the couclu- i.ut"--i-i.jj r a I . . . luiu mm ne nau uone more tor iim- sion tnat iig-tit exerts pressure in ericau commerce than all the acts of the direction of propagation. Ac- Congress since the inception of this cording to Maxwell's calculation government. February last there this pressure, at the surface of the were 98 cases of vellow fever in earth, amounts to 0.0000000000592 t - Cuba; this year there are none. And grams for each square centimeter an uiat 1 nv-cTja i y iu itcp uii. Luc 111 uin ijcx ugh auuatCi vjuiwc tuio i cTiilltyf tllC IdttCr IS tllVVtiys COM" a,ti - ccj luc iiiusuuiiu. jjiLuicmusL vai y mvciscij aa lu tinuous, with generalizations to Medicine is not a science. It is the square or the distance from the infinity, ii r t r I . j Til i -t 1 i i i I ine sum or a nair-aozen or more center or tne sun, it wouia, at tne The ancients, notablv Euclid. An- : i i.- in , -i r . cj.ijlj i i rv r I J sciences appnea , o one aennite ena. surrace 01 mat Douy, amount 10 u.u 0uonjUSt Pappus and Meneloas, Within the last titty years the med- W3 grams per square centimeter. aware of a few of the funda Therefore a cubical body having a volume of one cubic centimeter and the density the same as that of wa ter would, at the surface of the j. 1 i 11 if ue acieu on uy a repellent work of Carnot. Monire. Poncelet. torce ot U.UUz57d grams. Because orP:nPf. Vnn Stamlt ami f!haJw investigate, understand ana recora ot the gravitational attraction, it any case coming under his observa- would at the same time be drawn tion. lhe Held ot medicine is a towards the center of the sun. But broad one and one which offers un- gravitational attracton is proportio- equaled opportunities for the man rial to the mass of the bodvattract- ot brain and energy. Kapid advan- ed; that is, in the case of a cubical ces are now being made but much body, to the cube of an edge. The pressure or ngnt is proportional to incredible achievement. ,1 . . Cl'li "II" i 1 i 1 i tne area or ngnt muminateu; tnat The modern method of graphical is, in the case of a cubical body, to statics one itJ L,reat measure the the square of an edge. Therefore, as outcome 0f the discovering of mo- tne cuoicai Doay at tne sun is dern geometry ;hundreds of mechan- taiten smaller ana smaner still, tne ical and engineering problems are most conveniently and elegantly ical course of studv has increased irom inree or rour montns to tour years of hard systematic work rr i iii ine meaicai degree now requires an A. B. and four years of medical sun, study. A doctor should be able to remains to he known, know the truth and the make you free." "Ye shall truth shall le ruuua- mental p r i n c p 1 e s of modern geometry but the construction of system, wholly independent of the method of the ancients, was the iS. Poncelet wrote his monumental work with its enunciation of the principle of duality while confined in a Russian prison; Von Standi, the Eucld of modern geom etry, constucted a marvellous theory of geometrical imaginaries-analmost Athletics. The time is drawing near when track work will begin. It is hoped nnPiient on it diminishes mur.h les rapidly than does the attraction to that there will be a larg-e "turn out ootn or old and new men. With our oM men and some dark i it i i norses among- the tresnnien our prospects ror a strong team are good but it will mean work on the f t i part ot everyone there can be no resting- on last year s laurels or condition. March 17 is the date set for the beginning of active out-door work, providing that the weather will oermit. Every man who ex wards the sun's center. Similar reasoning holds for spherical bodies, TT 11 . 1 i tlence on very small particles tne repellent force would overbalance the force of attraction, and such particles would be driven off into space by the pressure of light. Use has recently been made of the pressure of light theory in explain ing why the tails of comets are al- ways directed away irom tne sun, pects to try ror a piace on tne team Astronomers generally hold the will be expected to begin prelitni- oni nIon that cometic matter consists solved by modern methods. Mod ern Analytic Geometry is in reality the algebraic side of Modern Pure Geometry. In a word the great principles of continuity and recipro city, together with that potent fac tor generalization, have given the geometry of the nineteenth century a distinction peculiarly unique, mod ern and essentially great. The principles of continuity and duality were represented by figures on the blackboard. i i t i r narv worK in tne gymnasium oerore February 25. Those men who an ticipate entering tor runs over halt a mile are requested to do their pre iminary work by cross-country running varying tne distance rrom halt to two or three miles, runs to be taken daily. Ei. VON DEN STEINEN, Coach. Meeting of the Elisha Mitchell Society. The Elisha Mitchell Scientific Society held its monthly meeting in the chemistry lecture room Tues. nur ht. Feb. 11th. The following- 7- 1 ' papers were read "The Pressure of Lkrht."bv Mr. Latta, "A Nine- teeuth Century Geometry," by Dr. Henderson and "Some of the Pro perties of Atoms," by Dr. Mills. This was thsmost interesting meet ing that the Society has had in some time. Mr. Latta said in part: of hydrocarbons of low specific gra vif . and it is known that all obser ved comets have passed very near the sun. Four or five have passed within 300.000 miles of that body. Kecent theory holds that, as t n e comet draws near the sun, small p.irticles of cometic matter are driven backward by the pressure of lig-ht and made to form the train of matter, which 'this pressure keeps pointing- awav from the sun, and which is known as the tail of the comet. The pressure of light theory is also an explanation of the aurora bore- alis. It is that negatively charged particles of matter thrown off from the sun: that those coming towards the earth are captured by the earth's line of magnetic force; and that a s these charged particles move along the line of force toward : magnetic pole they encounter dense layers of the earth's atmos- the pro thousand smallest visible. For a long time, the problem as phere atKi caused to glow, thus giv to the nature ot light and the man- -m the streamers of light known as ner of its propagation through space the aurora. hppM trivpn much attention bv ""' ' . tt i i : .f,W,nf nhvsics. What is per- lr. nenueisun sam in pan: ,. .....i. i. 4.U..4. u.. Koqm I The idea is very prevalent that naps tne uesL won us . - - , ... c.ia i.lc,f Ureometrv is the same today that it clone in mis uciu uuuu mc ia3, - - ... e,inHa uv Mnvwpil was in buchd s time over two thou who a few years ago formulated sand years ago what is known as Maxwell's elec- Among the various nevj systems Dr. Mills said in part: The problem is to find perties ot particles one times smaller than the particle microscopically Joule in 1857 gave the first approx imate measure of the average mole cular velocity making use of the kinetic theory of gases and the mec hanical fact that the blow delivered does not depend on the number of, particles but only on thier mass. Maxwell made use of the Calculus of probability and the principles of the conservation of energy to deduce i i... TU..t. more accurate escim-xLCi. xuus the motions of the particles becomes known. The free path of a molecule and the number of collisions per second are obtained by measurements ot the viscosity, diffusion and conduc tivity of gases and these methods . . i t ...4. rVU,, give substantial agreement. xuv- size of a molecule can be best esti mated from measurements made on the index of refraction and the di electric capacity. The size in con nection with the foregoing theories gives the number and knowing the number in a given space their mass and distance apart are easily ob tained. The results are startling but can be regarded as fairly accu rate estimates. 7V
Daily Tar Heel (Chapel Hill, N.C.)
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Feb. 21, 1902, edition 1
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