32 PATRICK GEDDES. 



separates a new outflow from the parent mass, often becomes 

 separated off, and encysts itself independently (fig. 13). FroM 

 this to such forms as those represented in figs. 14, 15, 16, the 

 transition is easy. The new cysts frequently, but by no means 

 universally, contain a portion of the red colouring matter so 

 largely possessed by this organism, their size may be approxi- 

 mately equal (fig. 14), or extremely irregular (fig. 16), and the 

 number may vary from two up to a dozen or more. Such forms 

 as those represented in figs. 6 a, Q b, where two equal or similar 

 cysts are formed, are rare ; still more so cases where a trans- 

 verse septum is formed without encystment (figs. 7 a, 7 b). The 

 young cysts appear usually to be liberated by disintegration of 

 the enclosing wall of the parent mass, but sometimes also 

 recommence activity \A'ithout this completely taking place as in 

 fig. 17, where one appears in active growth within the old wall, 

 while the others (two of which are closely united with the parent 

 wall) are empty. Small, flat, amceboid masses, almost naked, or 

 enclosed in very thin walls (fig. 10), occasionally occur on 

 the surface of the leaf; these are probably organisms which 

 have escaped from their cyst, and which, after a period of wander- 

 ing, are returning to the resting state. 



The new cysts, variable though they are, are quite distinguish- 

 able from the Proiococcits forms first described, and these latter 

 certainly do not arise in this way. hi what particular juncture 

 in growth the labyrinthuloid streaming takes place I cannot, of 

 course, say, yet am inclined to suspect that the Protococcus-like 

 germs may arise simply from detached fragments of the moving 

 network. 



When the Protococcus forms are not enclosed within the cells 

 of the Sphagnum, a considerable size is occasionally reached 

 before the spheroidal form is lost (fig. 3). I have observed 

 instances, both inside and outside the Sphagnum leaf, of division 

 into two and even four masses (figs. \a, 4, 5 a, b), a pheno- 

 menon of considerable interest, since the resemblance to Proto- 

 coccus is rendered much closer. The resemblance, too, of such 

 conditions, particularly of those represented in figs. 5 and 6, to 

 Glseocapsa, even in the disposition of the laminse of cellulose, is 

 even more striking. 



In the search for a nucleus, I have been no more successful 

 than Mr. Archer. Larger masses of protoplasm, generally im- 

 pregnated with red colouring matter, are very frequently present, 

 and occasionally one finds peculiar bodies which resemble a 

 nucleus, sometimes even with contained nucleolus (figs. 19 «, 

 19 b, 21, 23 b); these, however, are rather to be regarded as smaller 

 secondary cysts, formed in exceptional circumstances within the 

 general mass of protoplasm. 



