2l8 



THE BEGINNINGS OF LIFE, 



were watched on many occasions i. On the sixth day 



Monads 

 of the larger of them 



measuring 



If 



ISOO 



m 



length. 



Others had lost their flagellum^ and were existing in 

 the form of ovoid or rounded corpuscles, which were 

 motionless, though still provided with a vacuole, and 

 now also with a solid nucleus about o 



20000 



in diameter 



All 



d). All Stages were seen, between the 



// 



in length and a much larger 



ovoid corpuscle ^sVo 

 Amoeba of the kind just described, which was either 

 motionless or else, at intervals, exhibited slowly-evolved 

 and blunt protrusions from its periphyry. 



In other specimens the most easy and rapid alter- 

 nations were seen between the shape and mode of loco- 

 motion which pertains to Monads and those which are 

 characteristic of Amoebse. Monads which had been, 

 previously in active motion would at times come to 

 a state of rest, develop two or three vacuoles in their 

 interior, and behave in all respects like an Amoeba, 

 save for the presence of the now languidly moving 



flagellum. 



After remaining in this state for a variable 



time, some of them w^ould just as abruptly cease to 

 display the am(xboid movements, the extra vacuoles 



sumed — and with it 



lape of the Monad would be re- 

 the lashing movements of the 



flagellum which again gives rise to the rapidly-darting 



^ It took place mostly in a longitudinal, though occasionally in a 

 transverse direction. I have never seen the whole process occupy less 

 than twenty minutes. 



f/' 



Oo the seve 

 ;itioi(lal Ama 



'-!ize. Bey 



M 



I 



ffl, ad di^r 



one cont 



Ik was an al 



k substance 



same ki 



srani 



aiiiCEboid 

 '^^ size and 



- 



Id chai 

 t^eir aim 



Otttlie 



ei! 



aroui 



K\ 



spheric 



\ 



%:'«^ 



^IS 



\\ 



cec 



