100 Pink Monads and their Enemies. 



objects ; but changing the refracting power of the water with 

 a little glycerine sometimes will. Cases will occur in which 

 with all care the presence or absence of such a filament must 

 be inferred. Thus I found associated with the Chromatia a 

 number of extremely minute euglenee from a ten-hundredth to a 

 fifteen -hundredth of an inch long, and it was only in a few 

 specimens the filament could be occasionally seen, though, 

 doubtless, present in all. 



In searching for any filament that might be present in the 

 Chromatia, I adjusted the glass and illumination so as to show 

 it in other delicate objects in the same field, but never de- 

 tected any symptom of such an organ in any one of them. 

 The motion was evidently effected by expansion and contrac- 

 tion of the delicate membrane covering the little objects, and 

 when one of them was in a favourable position a wave motion 

 was seen from one end to the other of the integument. In 

 the annexed plate, a very large Chromatia, is shown in the 

 act of division, but I think the chief method of propagation 

 takes place in another way. After whirling and spinning and 

 wriggling* up and down and backwards and forwards for a 

 considerable time, the little sausages grew quiet and settled 

 down among a mass of their brethren, who had likewise 

 retired from the dancing dervish part of their business. They 

 were not dead, though no longer acted upon by " life's fitful 

 fever," and, I believe, in their quiescent state the vesicles 

 escaped and commenced a new growth. When a mass of 

 stationary Chromatia was examined, it was found to be ce- 

 mented together by a sort of pellicle, in which various objects, 

 including the lilliputian euglense, were embedded. This mass 

 likewise exhibited particles of pink matter in various stages of 

 growth, as shown in Figs. 1 to' 3. I could not obtain any 

 positive proof of the fact, but I think the little objects in these 

 patches were developing into Chromatia • at any rate a tole- 

 rably complete series of forms intermediate between the little 

 dots in Fig. 1, and the objects in Fig. 4, could be traced, and 

 it will be seen that Fig. 4 closely approaches the Chromatium 

 form. All these objects had a pink tinge, but it was deepest 

 in the full-grown specimens. 



When I first brought the pink Monads home, there were 

 very few full-grown ones that did not exhibit many vesicles ; 

 but, after the bottle containing them had been a week in the 

 house, the majority had very few vesicles, and some none at 

 all, though quite large enough to be entitled to many. The 

 development of vesicles had evidently been checked by want 

 of some conditions I was unable to supply. 



It is of no use to give such objects specific names, unless 

 it can be shown from their life- history that they are really 



