104 



ber of cells in any one pair of the primary tubes, the whole number of 

 cells in that portion of the plant may be known. In this instance the 

 stem is covered by 603 cells, most systematically arranged. 



Sixth. That there exists a class of cells at the joints, having 

 equal-sized, green globules circulating in them, instead of their being 

 attached to the lining. 



Seventh. That there are two divisions of the cells. Those having 

 a flexible vesicle gliding round, and those having none, these latter 

 having a slower and less visible circulation. 



Eighth. That the globule on the main stalk when complete inva- 

 riably consists of eight segments. 



Ninth. That the masses in the central fluid are affected by 

 gravity, but not those in the circulating one. 



Tenth. That the paving of green vesicles arranged in such order 

 on the lining is apparently the regulator, if not the primary cause, of 

 the motion of the fluid, as shown by fig. 23. 



Eleventh. That all growth is from the upper side of the knots and 

 not from below, the roots rising from the top and then bending 

 downwards. 



Twelfth. That the internal structure of the globule produces in 

 great number certain very singular moving bodies. 



