'^^. 



nts 



conte 



^^^■ff^^entsi,' 



uall 



y undenv 



I 



'ich old 



granule 



■ther Jaroe 



6^ Size, 



■ ^0 shape itsdt; ! 

 ^7) by means o( 



' withi 



its cfit, 



uch thinner (/' I 



stage, distindlf 

 atimegarera;; 



I 



; o{ the sped- 

 the water H 

 jduced from 

 ch appeared i« 

 .u'ing to sora' I 

 into the '"" 



t 



I 



leep 



ryos 



lin 



and W- 



u 



their 



-onia 



was F"- 



I 



y 



coflv' 



eX 



ai 



t:^^ beginnings of life 



469 



almost smooth, whilst its under surface was much more 

 complex (/??). Such specimens of Oxytricha and Plae- 

 sconia were, moreover, the only forms of Ciliata seen 

 in the solution from which the Chlorococcus vesicles 

 were taken. The origin of Oxytricha within the 



' °^ structure * filaments of Nitella has also been already referred 



to^ 



Facts just as remarkable can be stated concerning 

 the different modes of origin of Vorticellse. 



Thus, 

 although Vorticella-cysts are so frequently derived from 



r 



encysted Euglense, I have seen algoid vesicles budded 

 off from Vaucheria ^ (as well as others which have arisen . 

 from the very common but protean Alga named L.yngbya 

 muralls '^) also converted into Vorticella-cysts, and these 

 producing organisms in almost all respects similar to 

 those from cysts of Euglena origin. According to Dr. 

 Gros 4^ moreover, cellular bodies budded off' from Moss- 

 gth, contaiiiicj ^ sporangia may also undergo transformative changes in 



being produced by the molecular transformation 



all respects similar to those of Euglense. 



In many other cases, however, Vorticellse seem to 

 arise in an altogether different manner. Instead of 



of 



masses of matter which are at once converted into 

 full-sized though embryonic individuals, they are derived 

 from vesicles containing an animalized matter, which 

 bud out from^ or are protruded by, certain vegetal cells 



^ See p. 404. 



^ See Appendix D, p. Ix. 



^ See Fig. 82,/, and p. 415 

 * Log. cit., pp. 44S, 487, 



