﻿OF THE STATE OF GEORGIA. 63 



larger amylon grains which, until now, had been distinct, disappear. Fig. 11. Between 

 midnight and morning a longitudinal division of the cell takes place, which divides 

 it into two fixed, immovable cells (cells of quaternary formation.) Fig. 12, a. Very 

 shortly after this (one or two hours after) these last formed cells are each in their 

 turn seen to subdivide into two active gonidia furnished with flagelliform appendages. 

 Fig. 12, b. These last (cells of quinary formation) move actively even before leaving 

 the envelop of the mother cell, but before dawn finally break through it. They then 

 live the same independent lives that the first swimming gonidia had led, and go on 

 moving actively for two or three da,ys. 



This, second generation of flagel-bearing gonidia differs from the first only in being 

 green from the onset, each cell having at its birth and ever afterwards a small, red, 

 central mass ; whereas, be it remembered, the first generation of active gonidia were 

 red at first, and only acquired a green color some time after their liberation from the 

 mother cell. Figs. 13, 14. 



After a period of from 48 to 72 hours (and always during the hours of darkness,) 

 the second generation of motive gonidia each separate into two immovable cells, (6th 

 formation, Fig. 16,) each of which in their turn divide into two new motive gonidia, 

 (gonidia of third generation, 7th cell formation. Fig. 17.) This takes place inexactly 

 the same manner as in the preceding generation, and this multiplication goes on iden- 

 tically and uninterruptedly for a period of about six weeks, producing in that space 

 of time from twelve to nineteen successive generations of motive gonidia. 



The latter formed generations often differ somewhat from the first in having the 

 central red spot nearly obsolete or altogether wanting; (fig. 18,) and in some cases as 

 first seen by Von Flotow, in containing large internal hollow spaces, which displace 

 the green lining of gelatinous chlorophyll, giving a lacunose appearance to the cell. 

 Fig. 19. These internal vacuoles sometimes displace the central red mass, and render 

 it parietal, so as to make it resemble an eye, and give to Chlamidococcus the appear- 

 ance of a Chlamidomonas. Fig. 20. The green gonidia are very sensible to light, 

 they collect in greater numbers in that part of the vase they are held in, which receives 

 the sun's rays. Their respiration is identical with that of other green plants, i. e., 

 they disengage oxygen during the day and carbonic acid during the night. This fact 

 was noticed by Ehrenberg with respect to Chlamidomonas, without his suspecting, 

 however, its vegetable nature, as he describes it as having eggs, an eye and a testicle, 

 which are nothing else than the grains of amylon, the red mass, and the cytoblast 

 we have spoken of above, and which exist as well in Chlamidomonas as in Chlamido- 

 coccus. Each of the gonidia of the 19th or last of the motive generations, gives birth 

 to two immovable green cells, each of which shortly after is in its turn divided into 

 two other cells, but which, differently from what has been taking place in all the pre- 

 ceding generations, are unproductive of a new generation of cells. 



