~^.' 



tie 



les 





plant: 





e!l 



Poussent 

 ^s, de 



■tla 



^ualite i, 



as We 



on 



Lucheria 



■ 



'^ me to beli,, 

 nodes of 



oundupontheii 

 et \ Vorticei:? 

 f Xitella ! 

 ;ions Vortidk 



nal bud 



vithin the cleai 



Drpuscles. Tti; 



t 



I 



I 



I 



r. c. Hiw 



:ctly colourles 

 int of the 



\s it grows 



) 



r 



I 



I 



I 



q its own m- 



irdens 



; 



but its 



as 



the e 



ml"! 



(0 



ting """' 



■'-:S" 



oiflf 



> 



See p' -f' 



& 



r^^i? BEGINNINGS OF LIFE. 



471 



M 



moreover depicts ^ vesicles 



and vibratory contractions,' After ^ time the cyst is 

 ruptured, and then the granular embryo <^ after a few 

 very wry contractions, at once widely opens a large, 

 ciliate mouth, gaping across the sphere's surface ; and 

 disengaging or displaying a girdle of cilia round the 

 rear part of the body, it immediately represents the 

 free-roving Vorticella in full equipment 1.' 



radually increasing in 



size, which ultimately became converted into Vorti- 

 cellse; and lastly, M. Pineau described the mode of 

 origin of Vorticellae from vesicles which had been 

 developed in the pellicle by a process of synthetic 

 heterogenesis, similar to that which gives birth to 

 Paramecia and Kolpodse. These vesicles, after increas- 

 ing in size, first assumed the form of Actinophrys, then 

 of Acinetae, and ultimately became converted into well- 



developed Vorticella ^. 



In the last-mentioned mode of origin of Vorticelte^ 

 the starting-points were certain vesicles or corpuscles 

 developed from the pellicle, by a process similar to that 

 whereby Monads and Amoeba have been shown to 

 arise both in the pellicle and in other organic aggre- 

 gates ^. It is now, therefore, of importance to be able 



■* See 'Monthly Journ. of Microsc. Sc.,' Nov. 1871, p. 229; and SilU- 

 man^s 'American Journ.,' Aug. 1871, 



2 ' Heterogenie/ PL I. 



^ See p. 252. 



* It has, moreover, been fully proved that such mere motionless cor- 

 puscles, as well as Monads, Amoebae, and Fungus-germs, are all inter- 

 changeable and convertible forms of living matter. (See Chap, xvii.) 



1 



