THE SPERMATIC FILAMENTS. 299 



strength of from 5 to 10 per cent. In a solution of salt of 

 5 per cent., and of sugar of from 10 to 15 per cent., they 

 shrink up and become quiescent, though reviving upon the 

 addition of water : I have even succeeded in reviving the 

 OpaliruB, after they had been treated with a solution of 

 common salt, in the proportion of xoth. 



With respect to the development of the spermatic filaments, 

 I will here say only this much, that, from my latest observa- 

 tions, they are not developed in the nuclei of the spermatic 

 cells and cysts, but ottt of them. These nuclei^ which occur 

 either singly in small cells, or in numbers together, free in 

 larger cells and cysts, become elongated, and push out from 

 one end a filamentary process, whilst the principal mass con- 

 stitutes the body of the filament. The spermatic filaments 

 are at first coiled up in the cells and cysts, and are afterwards 

 liberated by the perforation of these receptacles, in doing 

 which they frequently carry with them portions of the walls, 

 forming the appendages and hood-like cauls which have been 

 already pointed out by other observers. 



