26G 



ACOTYLEDONOUS PLANTS. 



trifacial cells are readily recognisable by their colour, and less 

 their more defined outline. 



In both the capsules, the cells forming the walls present 

 greenish granules, in irregular masses ; generally towards the 

 centre, these granules are violetted by the application of tinc- 

 ture of iodine. 



The brown tint, or subsequent mature colour takes place in 

 all, even the abortive ones : the earliest and most completely 

 abortive, present a dark brown grumous disk, such being the 

 grume lining the cavity. In others less abortive, the mass of 

 grume is more independent, presenting many granular coagula, 

 in others these are mixed with small trifacial cells, in others 

 again the trifacial cells are many, disposed irregularly of a 

 larger size \ but not uniformly so. 



The three lobes of the incrustation are very well seen in 

 the younger stage: they alternate with the striae (PI. 123, 

 Fig. III. e,) around which the incrustation is not deposited, or 

 if so, in a small degree. At this time the slightest puncture 

 causes the escape of a grume from the secondary capsule, which 

 grume is granular mucilage. I imagine the incrustation to be 

 a deposit of its granules. In this grume also, a few trifacial 

 cells will generally be found. 



The next change is the appearance of its cellularity, in the 

 form of oil globules, or cavities. It appears to present a slight 

 attaching process, which is to be found in the centre of the 

 vertex, shorter than the tri-section, and arising from the con- 

 fluence of the three lines. 



In Chara, the early formation is much the same, but the 

 enclosure of the nucleus which is the continuation of the 

 branch, is not derived from a general development of an annu- 

 lus around its base, but from 4-5 distinct puncta, as many in 

 fact as there are spiral tubes in the mature state. The appa- 

 rent stigmata are nothing but smaller tubes growing from the 

 larger screwy ones. 



Now this is an additional reason why Nitella is not distinct 

 from Chara. If Nitella were organically distinct, the same 



