214 MISCELLANEOUS EXAMPLES 



such changes as I am about to describe were occurring simul- 

 taneously in hundreds of them. 



The iirst indication of this change is represented in Fig. 35, 

 A ( X 375), where in the Euglena to the left, with contents granular 

 but still green, there is an indication of some large spherical bodies 

 forming within ; while in the specimen on the right the bodies are 

 more distinct and partly decolourised. In the three specimens shown 

 in B, the whole substance of the Euglense is seen to have become 

 converted into such bodies, except for a small amount of refuse 

 granular matter, of a red-brown colour. In the specimen to the 

 right the decolourisation of some of the spheres is more complete 

 — their substance being homogeneous, and as yet unUke that of an 

 Amoeba. Fig. 13, C, represents one of these Euglense that was 

 photographed ten days later, and it will be seen that while the 

 cyst wall has become more indistinct the Amcebse have become 

 much more definite, the granules between them having for the most 

 part disappeared, while their own substance has become much 

 more granular — probably in part owing to their having swallowed 

 the pigment granules previously in contact with them. After 

 another ten days, in the last remnants of the original Euglena 

 pellicle, I found the specimen represented at D, in which the 

 Amosbse had distinctly increased in size, while only very faint 

 indications existed of the outline of the Euglena in which they 

 had been formed. I have seen some specimens like this slowly 

 changing in form, and beginning to take on an active existence. 

 In E the lowest of the Amoebas will be seen to have undergone 

 fission ; and this is the only instance in which I have ever seen 

 evidence of fission in these motionless Amoebas while still within 

 the Euglenas. The one to the right of that in which fission had 

 occurred showed a distinct nucleus. 



Great numbers of the Euglena were seen to be undergoing the 

 same kind of change ; dividing into separate, motionless bodies, 

 remaining of the same size, gradually becoming decolourised, and 

 undergoing molecular changes which converted them into motion- 

 less amoeboid spheres — while no active Amoebae were to be 

 found outside, and there was an entire absence of any evidence of 

 infection. 



(g) Transformation of Chlorophyll Corpuscles of Nitella 



into Amoebae. 



I have long been familiar with a difference in the rapidity of 



