424 Mr. H. J. Carter on the Development q/" Sorastrum, 



and each group eliminated in its proper cell, while the other 

 group, consisting of eight individuals, appeared to have lost 

 its cell, and presented a tendency to disintegration or separa- 

 tion of its individuals. All these grovips were 3-6000ths inch 

 in diameter, exclusive of the cell (which was a little larger), and 

 the individuals composing them 1^ -6000th inch broad, while 

 tlie individuals of the parent group averaged 5-6000ths inch 

 broad. 



When all development of the baby groups appeared to have 

 ceased, the whole was transferred to the level surface of a 

 glass slide and compressed, in order that the total number 

 of individuals in the parent group might be ascertained, 

 if possible, together with the number of those which were 

 empty and collapsed and of those which still retained their 

 gonimic contents, for the purpose chiefly of ascertaining 

 the relation in number of the five baby groups to that of the 

 individuals of the parent group (iig. 6). This gave two of 

 the former {b b), seven of the latter (a), and five baby groups 

 (c) ; but, as will presently appear, all the empty individuals 

 were not visible. (See all this delineated in fig. 7.) 



Further, to ascertain the alterations in form which the indi- 

 viduals still retaining their gonimic contents had undergone 

 in their cell-walls and spines respectively, as there was already 

 evidence of something of this kind havmg taken place, and to 

 determine, if possible, how many individuals composed the 

 original group, the whole was subjected to a still greater 

 amount of compression, viz. sufficient to burst the green indi- 

 viduals and get rid of their contents (fig. 7), when it was ob- 

 served that, in addition to these seven (a), there were the cells 

 oi four empty collapsed ones, and the remnants of some more 

 which had never been fully developed, or, if so, had only left 

 fragments of tlieir cells attached to the rest [b b). 



Thus there was evidence of four distinct empty cells and the 

 remains of some others ; so that tlie original group, probably, 

 belonged to the 16-division. 



This was not all ; for the cell-walls of the green individuals 

 had not only become larger, rounder, and more inflated by an 

 actual increase in their gonimic contents, but the spines in 

 several of them had become so far atropliied that here and 

 there they were entirely gone or represented only by a little 

 papillary eminence (c c) — an alteration Avhich had previously 

 been witnessed in isolated individuals drawn up among the 

 sediment by the dip-tube. 



I have already mentioned the ap]:)carance of another group 

 of sixteen individuals (or of the 16-division cell), the whole of 

 which were collapsed and empty, with the ])rosence of from eight 



