390 



THE BEGINNINGS OF II FE. 



ducts undergo, bear therefore a close resemblance to the 

 metamorphoses witnessed by M. Nicolet (pp. 383-386)* 

 Mr. Carter has also described the mode of origin or 

 appearance of certain 'tubulating germ cells,' which 

 seem closely to resemble the peculiar fungoid growth 



Fig. 77. 



Formation of Pythium and of Astasice within cells of Spirogyra. 

 (Reduced from Carter). 



a. Mode in which Pythium first appears. 



h. Corpuscles with tubes, through which the contained granules are 

 voided. 



c. Empty corpuscles after discharge of granules. 



d. Formation of Astasise within a contiguous compartment of Spirogyra. 



e. A spore of Spirogyra, into which one of the tubules of an inosculating 



group of corpuscles (/) is penetrating. 



described by Dr. Pringsheim^ as Vythtum entophytum. This 

 is represented as a colourless, flask-shaped or pyriform 

 organism, with a more or less elongated neck ; and it is 

 stated to occur in both animal and vegetal tissues. 

 Mr. Carter says 2 : — 'Just after the conjugation of Sp'rc- 

 gyra^ a number of spherical cells filled with minute 



1 ' Ann. des Sc. Nat.' (Bot.), 4 Ser. t. xi. pi. 7, fig. I. 



2 « Ann. of Nat. Hist.' vol. xvii. p. 113- 



