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Show ACCLIMATION; OR, TJIE INFLUJ~NCE OF more violent and dangerous form. The latter fact holds good of yellow, as well as of remittent fever. Dn. BouDIN, in his "LettreB Bur l'Algerie," afier establishing the persistent influence of marsh malaria on French and English colonists, continues thus : "Itcstc il. examiner l'infiucncc e:xercee sur lc chi fire des decca par le s6jour dans loa Iocalit6s do !'Algerie, non su;'ettes aux t!manations paludeennea, mtlis so distioguaut do la Frnnoo uniquomcnt par uno tomp6raturo 61ov6c. A d6faut do documents assoz nombroux recucillis en Algerie memo, nous invoquorons los faits rohttifs il. deux possessions nnglaiscs n.ynnt Ia plus grande nnalogic thcrmom6triquo nveo notre possession africainc; nons voulons pnrlcr: 1°, du Cap de Bonnc-Espernnco; 2°, do Malto: l'un ot l'autro provorbialemont cxomptcs do 1'616mont palud6cn. "Au Cap de llonne-Esp6rnnce, In mortalit6 de trois regiments nnglnis, do 1831 il. 1886, a 6t6 ropr6sent6c par loa nombrea auivants : En 1881.... ..... ............ ... ...... ......... ...... ........... ... ...... .. .... 26 d6cbs. " 1882 .. ...... .. .... ........ .... ...... .. .... .... .. ... ...... .... ..... .... .. .. . 26 " " 1883 ........................................................................ 28 " " 1884 ...... . ................................................................ 28 " " 1886 ........................................................................ 84 " " 1886 .............................. .. ........................................ 38 " "A Mane, ou !'on pent consid6rer lea ltommoa lea plus jounes commo loa plus rt:!cemmoot a.rriv6s d'Anglctcrrc, In proportion des d6cbs n. auivi Ia marchc ci-aprba. Au-desaous do 18 ana .............................. 10 d6ces sur 1000 hommcs. De 18 il. 26 ........................................... 18.7 " 26 il. 88 ........................................... 23.6 " 83 il. 40 ........................................... 29.6 " 40 il. 60 ........................................... 34.4 "En resum6, les tmnlogies puisccs, non f«:lulomcnt dana los loon.litc!s pnlucl6cnuos, mnis encore dans los contr6os non mnr6cagcuscs, n.yant uno plus grande nnnlogio climatologiquo o.voo l'Alg6rio, so montrent peu favorable il.l'ltypothcso de l'acclimntmcnt." IT e then goes on to give statistics both of the civil and military population of Algeria, which show still more deadly effects of climate. If we turn now to tho physical history of the Negro, we shall find tho picture completely reversed. lie is the native of the hottest region on the globe, where he goes naked in tho scorching rays of tho sun, and can lie clown and sleep on the ground in a temperature of at least 150° of Fahrenheit, where the white man WOL1ld die in a few hours. And while tho degenerate tropical descendants of tho whites arc regenerated by transportation to cold parallels of the temperate zone, experience abundantly proves that, in America, the cgt·o steadily deteriorates, and becomes extcrm ina ted north of about 40° no1'Lh latitude. The statistics of New England Now York and l")hiladclphia, abundantly prove this. The mortality of blacl~s in our N orthorn States averages about double that of tho whites· and ulthough their natural improvidence and social condition rna;, and CLIMATE AND DISEASES ON MAN. 3()7 do, have an influence on this result, still, no one conversant with tho facts will deny tho baueful influence of cold upon the race. It is evident, then, that tho white and black races difr'cr, at the P.resent day, as much .in their physiological as they do in their phy~ 1Cal characters; and until their actual characteristics are changed, 1t cannot be expected that their normal geographical rauO'e will be onlat·ged. The respective typos whieh they now present~ antedate al.l human, writtc~, or monumental records, and will only disappear w1th the other typteal forms of our] anna. We may here r fer to another curious train of facts in connection with tho adaptability of the above races to climate.' We allude to the results of crossing or breeding them togoth r, which seem best e:~:plaincd by tho laws of hybridity. The mulattoes, no matter where born, north or south, possess charactcl'istics, in reference to medical climate, intermediate between tho pure races. The mulattoes brought from Mary laud or Virginia to Mobile or Now Orleans suHor inftn itoly less from the diseases of tl1csc loca'lities, tl1au do th~ pure wlritos of the same States. In Jact, the smallest aclmixtnrc of , negro blood, as in tho Quartoroou or Quinteroon, is a great, thongh , not absolute, protection against yellow fever. We have, in tho . course of tw nty years' professional observations, in Mobile, soon this fact fully tested; and it is conceclecl, on all bauds, throughout tho South. I rov.iously to tho memorable yellow fever epidemic of 1853, we never saw more than two or three exceptions; and although there were more examples in that year, sLill, the mmtality was tdfl.incr compared with that of the pure whites. I hazard nothinO' in 1 . b t te asserLJon, that one-fourth negro blood is a more perfect protec-tion against yellow fever, than is vaccine against small-pox. Tho subject of hybridity has been very imperfectly understood until the last few years; and to the late Dr. Morton arc we mainly indebted iot· tho advance actually made. lie has shown that there is a r gular gradation, in hybridity among species, from that of pcrfo ·t sterility to perfect prolificacy. 'l'hc mulatto would seem to fall into that condition of hybrids, where they continno to be more or less prolific for a few gcn mtions, bnt with a constant tenclcney to run out. The Wca is prevalent with ItS, that mnlattocs arc less proli fie than either pure race; suffi r much from tubercular afloctious; theit· chi ldren die you nO'; and that tlJCit· average duration of lito is very low. 'l'hat all this is true of tho cross of tho pure whites and blacks, I have no doubt; but those rcmal'h apply with less force to the Cl'OSS of Spania1·ds, Portuguese, and othct' dark races, with the negro: those afliliato much better. If we could s ]oct tho pu!'obloodcd races, put them together, and continue crossing them for |