194 PARASITES OF MAN 



attack of chyluria six months back, at which time lymph- 

 scrotum appeared, and also scrotal elephantiasis. Dr Bourel- 

 Ronciere pronounced this case to be unique, and attributed 

 nearly all the disorders to the presence of Wucherer's em- 

 bryonic FilariaB. In a very elaborate analysis of and com- 

 mentary on Dr da Silva Lima's second memoir, Dr Bourel- 

 Ronciere warmly claims for Wucherer the supreme honor in 

 all these discoveries. A number of affections hitherto regarded 

 as distinct, and all of which appear to be due to the action of 

 Filarise, are regarded by Dr Bourel-Ronciere as mere phases of 

 one and the same disorder. This affection he terms Wucherer' s 

 helminthiasis. Dr Manson had indeed arrived independently 

 at a similar conclusion, and I am confident that Wucherer, 

 were he alive, would in this particular aspect of the question 

 be the last to claim priority either to Lewis, to Bancroft, or to 

 Manson. 



In this place I may observe that Dr Pedro S. de Magalhaes, 

 of Rio de Janeiro, detected free microscopic nematodes in the 

 potable waters of Rio (agua da Carioca), which from their 

 similarity he supposes may have some genetic relation with 

 Filaria Bancrofti. In this opinion I cannot share. 



As regards the metamorphoses of the embryo, Manson states 

 that for a little while after gaining access to the stomach of the 

 mosquito the embryo undergoes no change (Fig. 40, a). In a 

 very few hours changes commence, resulting in wider separation 

 of the outer skin and an appearance of transverse markings on the 

 body within (b). In the next stage oral movements occur; 

 the striation becomes more marked, and the outer envelope is 

 cast off (c). Then the striated lines disappear and a dotted 

 appearance is substituted (d). From this condition the embryo 

 passes to what Manson calls the chrysalis stage, in which nearly 

 all movement is suspended and the large spots gradually dis- 

 appear (e, f, g, h, i, j y fc) . The tail continues to be flexed and 

 extended at intervals and the oral motions cease. By the 

 close of the third day the embryo becomes much shorter and 

 broader; but the finely pointed tail retains its original dimen- 

 sions, projecting abruptly from the sausage-shaped body (w, n). 

 Large cells next appear in the interior of the body, and by a 

 little pressure one may detect indications of a mouth (o, p, q, r) . 

 At this period the embryo begins to elongate, and at the same 

 time to diminish in width ; but the growth takes place chiefly 

 at the oral end of the body. The mouth becomes four-lipped, 



