/ 



f 



to elon^ 



- characteti 

 that the [£, * 

 of the ani, 



i 



close, '(|E'i: ' 



3 



un eiuDoie . 



de leur dc- 



I 



appearance 

 311 of vea 



it 



n 



indistinct 



ibout 



came 

 ,onent eel 



p 



5t separ 

 I fine whir 



i 



I 



; circu 



infef' 



/ere 



at 



tnothef) f^; 



> 



gepara 



r 



a 



tions 



doo' 



Iti 



.mas 



dev« 



.£#*■ 



:rir 



I'asP 



erf 



* 



t 



f 



THE BEGINNINGS OF LIFE. 



T97 



The corpuscles gradually moved more briskly- and finally, 

 detaching themselves altogether from the pellicle, they 

 became free-swimming animalcules each of which had 

 a rapidly vibrating flagellum. Their development fre- 

 quently took place in groups of various sizes, as above 

 described j but when the solution contained less organic 

 matter, or when the weather was colder, single isolated 

 corpuscles were frequently seen developing in different 

 parts of the pellicle. 

 ^ The description given by M- Pouchet of the mode 



Cl 



<»* 



o ^ ^c * o - e 



O PC 



■".C 





o o 



no 



z 





^''co a or.-.o 



-PC 





oa 



'-.vc^^"..° f?o °v "«?;■•.% "0°"" 



00 







<^O^^oc-,r,^.^o" 



\ o 



"''^00 



^s* 













*^"» 



(tO 









•B^^; 



.0 



*■ 





O 



'^^-^o'-'-^o^.-o 



"J J ■' _ ^^ w *^ » ^\ 



o ^Q j^ o^ i: o o ^t»o 





^ ^'^{° 



" ft P 





J 



/ 



^ " c o o c .0 



O H^l* 









o <^ *' 





'^^*_.^?oV 



J 0«;,w O c-,j o 



**J 







;- ^Q t* o 



^0 » "o^"o f ^ 00 







COq^ o^^O "'w C 



»" ^a o , C f 



^"?o 



O O 



'^o^o o -^ 





O^Q o 



3 

 4 ^^QO'^flOClOeti 



-^o 



■^o».°:o'_«o-*v% 



O o 



00^ 





^ o '^ ^ ^ o > 9 ^ 



o-^O 





f* • 'J ti 



oc>< . o c ^ 



%^ 





Q 





<>°Q^ c-* 



p o 



F* o * ' ^ 



^ ° ^ ^n*r C 

 o ^'^ * C 



e 







y^ 



<^^ca. 



Fig. 52. 



^' 



Origin oi Monas lens, (Pouchet.) (x 1800.) 



a. First Stage. 



h. Tailless Corpuscles 



c. Corpuscles with motionless tails. 



d. Fully-developed Monads. 



of evolution of Monas lens is essentially similar. He 

 observed the first rudiments of them in the pellicle of 



