ANIMAL MICRO-PARASITES. .")!>.") 



relapsing fever, closely resembling relapsing fever in 111:111. At the 

 same time it is worth recording that until Steel observed the 

 presence of the parasite described by Evans he regarded the <> 

 break as malarious in origin, and provisionally tcnnrl it ;M~ 

 typhoid. In the Burma outbreak, as in the Punjab epidemic, 

 considerable evidence was adduced in favour of regarding the disease 

 as being due to bad water supply. 



Steel succeeded in staining the organism with aniline dyes, hut 

 his description of the parasite in the fresh state differs very 

 materially from that given by Evans. 



Steel failed to recognise the round body tapering in front to a 

 neck. To him the bodies appeared thick in the middle, gradually 

 diminishing in size in either direction, with a blunt ami rigid 

 extremity at one end. The opposite end he described as tapering 

 in such a way as to produce a subspiral prolongation, which was 



uncurled and lashed about freely like a whip. This tail was 

 described as slender in relation to the general size of the parasite ; 



but under the highest power available the presence of a col 



fiagsllum could not be detected, nor, he adds, did the movements of 



the blood-constituents indicate its existence. 



Steel also failed to see the slightest sign of the two fin-like p;. 



on each side as described by Evans an opinion in which he was 



supported bv Lewis. 



These two observers, Evans and Steel, also differed as I 



the movement could be called spiral. Steel felt con 



movement was as much of that nature at times as can 



from organisms with so open a corkscrew shape; whil, 



maintained an opposite view. In the dried and stained , 



Steel observed that they retained their subspn-ai 



markedly spiral form of tail. 



Steel found that the disease could be column 



and to the monkey, and then the resembl 



to the spirillum of n-lap>in- f,-vrr in 



From the different apr.n.n,^ pr nted l.y < h- ,,- - 



in the living state and when ,lri,l.,.,.l st ,i.,. 3 



therewas^ahlya.illel , r^-hla,,,. , H, 1, 



anaMa......!........,, 



r.= 



, 



pointing out the 1 f F ** ' 



