212 MISCELLANEOUS EXAMPLES 



sub-spherical masses, such as are to be seen in B. Here they do 

 not differ much from the bodies seen in A, though in C they are 

 distinctly different — not only less numerous, but beginning to 

 decolourise in both the specimens shown. In D the decolourisa- 

 tion has become more complete and the embryo Amoebae (seven 

 or eight in number) more distinct, and mixed only with a small 

 amount of refuse matter in the form of reddish-brown pigment 

 granules. In E the decolourisation of the Amoebae is still more 

 obvious, and two of them have made their way out, and are lying 

 one of them above and another at the right extremity of the 

 resting-spore. Among the many specimens I have examined one, 

 rather larger than usual, was seen containing a dozen or even more 

 of these Amoebse. The wall of the spore was thinned and about 

 to give way. 



Here again the facts seem only capable of explanation on the 

 hypothesis of Heterogenesis. 



As in the case of the large Confervoid cells, the transformations 

 of whose endochrome I have described elsewhere,' the masses 

 which subsequently develop into Amoebas seem evidently to be 

 actual segments of the cell-contents. They are not seen at iirst 

 of smaller size, and gradually enlarging, as might be expected 

 if minute Amoebae had entered from without, and had gra- 

 dually devoured the contents of the resting spore. What is 

 really seen is that the contents of the resting spore aggregate 

 into 6-12 green masses, whose size remains fairly constant, but 

 whose substance undergoes a progressive decolourisation and 

 metamorphosis ; with the result that just so many colourless 

 Amcebae appear, and make their way out from the thinned 

 envelope, leaving behind them only a few refuse pigment 

 granules. 



(e) Transformation of the Substance of Vaucheria Resting 

 Spores into Amoebae. 



The transformation of Vaucheria resting spores into Amoebae 

 is one which I have only seen on a few occasions, so that as yet 

 I have not been able to trace all the stages of this change in a 

 complete manner. 



In Fig. 34, A (x 375), one of the thick- walled and very large 

 resting spores of V. Dilwynii is represented. It was filled with 



' " studies in Heterogenesis," pp. 3-9. 



