^^. 



corpuscles 

 ^hich 



exist 



In 



L 



in fishes 

 en more 



ass of gramli: 

 bivalved em. 

 unction of k 

 :tions eitki ;; 

 :iply with 



% 



!t 



ire c 



; their origii- 



i 



lies, wliicM:, 

 ^selves into- 



\. 



so 



a 



extre 



to 





ocuous 



=": #*' 





THE BEGINNINGS OF LIFE. 



355 



certain that in this affection — named ^ pebrine ^ on 

 account of the " black spots which are produced on the 

 skin — Psorosperms of the simplest description abound 

 in almost every organ and tissue of the affected worms 



M' 



P 



M' 



j_--^i.^~- / „._...rrbr_-^^p 



L (/ ^ " /7^^..-^ '■■' — ^— ^ -~ ^^rra 



i \ 11 ^^ 









....2*'-^-\Lk.7r/:^'^ 





...-L-w: vipt^i^ 



Fig. 74. 

 Psorosperms and their Mode of Development. (Balbiani.) 



a, a. Psorosperms from the Silk-worm. 

 h, b, and c, c. Rare and occasional varieties of these. 



X, y. Psorosperms in an earlier stage of development, which are 



found intermixed with the more perfect forms. ( X 1 700.) 



M, s. Portion of the intestine of a small Caterpillar {Gastro- 



pacha), showing masses of Psorosperms in different 

 stages of development beneath the serous coat. At 

 first, mere homogeneous masses of matter (p, p) appear, 

 in the midst of which Psorosperms are developed after 

 the manner of nuclei. ( x 250.) 



or moths. Whether they are causes of the disease, 

 however, or are mere concomitant products, really 

 occasioned by a previous blood-change (and therefore 

 comparable with the fungi in muscardine), it is im- 



from 



A a 3 



