88 



THE SCIENCE OF LIFE. 



phenomenon among Protophytes, and shows that the 

 bioplasm of the vegetable and animal cell have similar 

 properties. 



6. Dr. Carpenter recommends those who wish to study 

 the development of " zoospores," and other phenomena 

 of Protophytes, to have recourse to the little plant called 

 Achyla prolifcra, which grows parasitically upon the 



bodies of dead flies 

 in water, etc. The 

 naked eye perceives it 

 as tufts of minute col- 

 orless filaments, which 

 the microscope shows 

 to be long tubes con- 

 taining granular bio- 

 plasm, which exhib- 

 its the motion called 

 Cyclosis. (Chap. IV, 

 Sec. 6.) After about 

 thirty-six hours the 

 bioplasm accumulates 

 in the dilated ends of 

 the filaments, and its 



FlG. 27. Development of Achyla prolifera : A. Di- 

 lated extremity of a filament, 6, separated from the endochrome, Or gran- 

 rest by a partition, , and containing young cells in t I'm f f **r 

 progress of formation. B. Conceptacle discharging Ulai> COJ natter, 

 itself, and setting free young cells, a, 3, c. C. Portion Breaks UP into dis- 

 of filament, showing the course of the circulation of 

 granular protoplasm. tinct ttiaSSCS, each of 



which becomes a zoospore, or " motile gonidium,"with 

 cilia, and is set free by rupture of the wall of the parent 

 cell. (Fig. 27.) 



7. The family Desmidiacece consists of minute Proto- 



