1898.] 



MICROSCOPICAL JOURNAL 



153 



must he distiuguislied from vacuoles. Wlieu about to 

 re[)i-odncc the cell hecomes dumb-bell shaped (fig. C) 

 after which two nuclei format opposite ends (fig. D) and 

 finally the two parts are separated (fig. E). 



A. Simple Plant. — Take a single thread of the green 

 scum from a pool of water. Under the microscope, find 

 it to consist of a string of single cells (fig. F and Gr). 

 The single cell, F, is afterwai'd divided into two, and the 

 second produces a third, a fourth and fifth and so on 



until seven are showMi in Gr, the lower cell of which is 

 commencing to divide to form a new one. The outer 

 wall being continuous makes a thread-like object which 

 differs from the amoeba, wherein the outer wall separa- 

 ting, many separate individuals are produced. Why the 

 cells of algse string together like a thread, when repro- 

 ducing, and those of the amoeba, in like circumstances, 

 break apart, the microscope does not reveal, neither does 

 it show wiiy a cell made in nature is alive and one syn- 

 thetically like it, made by a chemist, does not possess 

 life. 



