216' THE PHENOMENON OF 



the same time a number of small, sharply defined, 

 brilliant globules were formed in the interior, having 

 quite the appearance of drops of oil. In this altered 

 condition the Chlamidomonada remained, exhibiting 

 neither growth nor increase. At the end of the month 

 of May, in the hope of causing a renewed development, 

 I allowed the dish to dry up, but it was in vain ; even 

 when I poured water on them again about a month 

 after, no perceptible alteration occurred. I let the mass 

 dry up again, and added water again in the middle of 

 December following ; towards the end of December, and 

 in the course of January, active Chlamidomonada actually 

 reappeared. All the resting globules had meantime 

 changed colour to some extent, appearing light reddish ; 

 the first "swarmers," also, formed by the halving or 

 quartering of the contents of the resting globules, and 

 brought to light by a rupture of the tough coat, at first 

 exhibited a reddish or greenish-red colour, which only 

 passed gradually into pure green, the drops of oil 

 vanishing at the same time. Only a small proportion of 

 the resting-cells came to such development in cultivation 

 in the house ; others divided, without loss of the red- 

 dish colour, into quietly vegetating cells connected in 

 groups, in a manner similar to that I have described in 

 Chlamidococcus ; others remained unchanged until spring, 



ion 



at which time, however, I did not pursue the investigati 

 any further. There is no doubt that future investigation 

 will detect in the Volvocineas resting stages for the 

 winter sleep, similar to those here examined in CUami- 

 dococcus and Chlamidomonas. 



Collecting together the phenomena of dissolution we 

 have been examining, connected with the Rejuvenescences 

 in Cell-life, we find that it results from them, that the 

 development and propagation of the Vegetable organism 

 does not consist of a bare series of formative processes, 

 but that processes of de-formation or "undoing" enter as 

 necessary links into the course. The plant, however, 

 differs essentially from the animal in this respect ; while 



