1 10 //(>/ '/.. /.V.I/ ( >/' TfSSVS. 



bioplasts of tlu- tissues might be expected to belong to 

 the blood bioplasts. And in the case of some of the 

 lOM vr animals \\ Inch exhibit the power of reproduction 

 of lost parts aiul organs, it appears very probable that 

 the agents directly concerned in the development of 

 the-.e are bodies resembling the blood bioplasts ; and 

 that from them result masses of bioplasm which take 

 pail in the foimation of the several tissues of which 

 the new member is constituted. 



Bioplasm of tJie Tissues of the Adult. As the tissues 

 ait foimcd by the conversion of the outer part of 

 each bioplasm mass into the formed material or tissue, 

 the distance by which the several masses of bioplasm 

 are separated from one another becomes greater. 

 This important fact may be demonstrated in almost 

 any tissue of a voting or adult animal. In 1 , _;S 

 and >), plate IX, are represented young and fully 

 formed cuticle of the newt from the very same spot 

 of skin. The formed material of the cuticular tissue 

 accumulates around each mass of bioplasm until the 

 well known adult " cuticular cell" results, Fit?. 39. 



Again, in Figs. 40 and 41, the appearance of - 

 tions of permanent cartilage from the same part of 

 the body is given under a power of 700 diameters. 

 At an early period of development "tissue " scarcely 

 its, and all that can be discovered is bioplasm. In 

 young tissue, at all periods of life, the same fact is 

 observed, but as the textures advance towards ma- 

 turity the proportion of bioplasm in a given bulk of 



