ALG^. 109 



numerous the chlorophyl was not included. This 

 was the process when the cells of Spirogyra were 

 not pregnant with starch, as they are just before 

 conjugating. When these changes took place at this 

 period they were somewhat different, insomuch as 

 the whole of the contents of the two conjugating cells 

 became united into one mass, and having assumed a 

 globular form, remained in that state until the chloro- 

 phyl had become more or less brown. After this the 

 protoplasm reappears at the circumference of the 

 mass in two forms, viz. in portions which leave 

 the mass altogether, after the manner of rhizopods, 

 and in the form of tubular extensions, which maintain 

 their connection with the mass throughout. In both 

 instances the protoplasm is without chlorophyl, but 

 charged with oil-globules, and both forms make their 

 way to the confines of the Spirogyra-ctW, which they 

 ultimately pierce, develop their contents, and dis- 

 charge them, in the following manner : — 



" On reaching the cell wall, each form puts forth 

 a minute papillary eminence, which, having passed 

 through the wall, expands into a large sac, or bursts 

 at its apex. Following the isolated form first, this 

 then gradually drags four-fifths or more of its bulk 

 through this opening, sometimes so much as only to 

 leave a little papillary eminence in it, which then 

 makes the portion of protoplasm look as if it were 

 entering instead of escaping from the Spirogyra-zoW ; 

 the internal contents of this protoplasm then become 

 more defined and granular, the granules assume a 

 spherical form respectively, they evince a power of 

 locomotion, and the originally flexible pellicle having 



