( 530 ) 



7'liis iii(|iiii-v _vi('l(l(Ml tlio i'cmiII, tlinl iii (lic iiiai'sliy iillnxial plains 

 which (-(msisl ciitii-cly of ACüelahlo and animal ivniains, niahiria 

 hardly o\ci" occni's, as ()[)|)()sed lo tho nplands \\1um-(' nearly all 

 childi-on snllVi- from clironic inalai-ia-infeclion. Al Iho same lime I 

 saw, llial soon aflei- hiiMli llie liai'dened and enUii-,u-ed milt makes its 

 a])pcai"an('e, tor it was lojiu' Ueloi-e I conld find a Da.jak child of three 

 weeks old, whose milt was not to lie tell. 



It is im|)ossiltle to uive the morbidity and the mortality cansed by 

 the malaria-infection amon.u- the j»opnlation of the n|)lands in ri«iiivcs. 

 I oidy fonnd the death-i-ale in Sambas e\tendiji<>- over B normal years, 

 i.e. yeai-s withont cholera or smallpox, to be for Dajaks 87 per '1000, 

 for MalaAs 28 j)er 1000, which how e\"er <lo(>s not represent the inliiience 

 of the malaria, becanse there ai'e also some .Malays who li\"e in the 

 ni)lands and amonji,' those, who ha\'e chielly settled in the lower |)laijis, 

 diseases of the digestive oi'uans are mnch more fre(pienl than among 

 the \u\\>. 



In ordei- lo appreciate fnlly the inllnenc(^ of the malai"ia-infection 

 on the existence of the inhabitants of tiie hiuhei- regions, we must 

 dwell for a moment on the phenomenon, which prof. Koen says that 

 he obser\'ed in New-Gninea, namely, that tlie nalixe, who went 

 thronuh the malaria-process independently i. (\ withont any aid excei)t 

 his constitntion. became inmume auainsi it. Many are the rcdnlations 

 addnced against this statement by |)hysicians, who |)ractise(l in New- 

 Gninea. They all pointe<l ont how frecpieiilly also adnit Paj)oeas 

 snlfei'iMl from malaria. 



Jndginii, In m\ experiences among the Dajaks, the Irntli li(^s betweeji 

 the \\\{). 1 also lia\e been strnck by the fact that not so many hard 

 enlarged units as symptoms of the malaria-infection are met \\\\\[ 

 among adult l)ajaks as among children njider the age of ten. which 

 certainly ])oints to a less strong iidhiencc of this iideclion. Moreo\cr 

 there is a great diiference between the action of chinine on Dajaks 

 and on Enro])eans, who are not inrnnnie. Thongh Ave nnisl make 

 allowances for other factors than imnumity. yet it is remarkable, 

 that \ve obtaineil nuich gr(>ater i-esidts A\ith at most J gram sniphas 

 chinini a day among the Dajaks than x\itli 2 to .'> gr. nun-ias chinini 

 among l']nropean soldiers, seized by malaria in Lombok. 



Among the former it \\ as possible to cnre not oidy the acnte cases 

 of malaria, bnt also cases \vhich had contiiuied from 4 to (5 months 

 and had not been treated l)efore, by administering 1 gram sniphas 

 chinini per day and per dose dnring 8 days, whereas in the first fonr 

 months after the war in Lombok in a ndxed gai-rison of 1500 men 

 nioi-e than 500 Lnropeans had to be removed, most of them by far 



