156 



THE BEGINNINGS OF LIFE. 



spect 



As previously mentioned i, Lepomitm 



pro- 



duces motionless reproductive corpuscles, whilst the 

 protoplasm in the almost similar terminal chambers 

 of Ach/ya produce active spores ('zoospores'), which 

 after a time become stationary and develop filaments 

 similar to those from which they have been derived. 

 The reproductive units of other Fungi {Mycetozoa) 

 appear as Amoeba, which after a time themselves take 

 on the characters and mode of growth characteristic of 

 a fungus. And finally, each of these forms (Amceba and 

 Monad) which is thus related to the common form 

 (Fungus), has been proved by many observers to be 

 easily interchangeable with the other. Encysted Amceb^e 



as we have 



Monads 



Haeckel, and others, give 



their turn lapse easily into the more slowly-moving 



reptant Amoebae. Similar transitions, moreover, from 



the active flagellated Monad, to the slowly- moving 



vacuolated Amceba, I have seen dozens of times, whilst 



watching these forms under high microscopic powers, in 



various infusions. I have also seen numbers of simple, 



motionless corpuscles, resembling some forms of ToruU^ 



gradually begin to take on amoeboid characters and 

 movements 2. 



4 



Facts of this kind^ even independently of those 

 which will be subsequently adduced ^^ tend to reveal 



See vol. i. p. 182, note I 



See Fig. 55. 



In Chap, xvii. 



r0 



V 



i 



1 



i :. ifldi^^^^' 



and tail^ 

 Arcbebio 



i^' 



4 



') 



^r 



exists 



bet' 



\ 



taifl 



.m size ma, 



■ .;g organic fo 

 inoveinents 



;i 



lliUU' 



\\t still ha 

 ' ill have been 



to the 



the 



in the sol 



e. In 



man 



k highest i 

 Seated flu' 



^^■en a fi 



S«{, 



