14 EXPLANATION OF THE PLATES. 



PLATE LXT. 



Fig. 1. A portion of Char a vulgaris : a, b, c, d, e, f, g, h, in- 

 dicate the cells in which a circulation somewhat different 

 from that of the ordinary cells is manifest, the current 

 taking a circular instead of its usual spiral course. Fig. 2. 

 One of the sprouts more highly magnified, the arrows in- 

 dicating the courses of the molecules. Fig. 3. shows the 

 root cells, the currents in these agreeing with those of the 

 stems, due allowance being made for the difference in the 

 direction of their growth. Fig. 4. In fig. 4. the glo- 

 bule is represented in profile with the stalk on which it 

 grows ; also the nucule surrounded by its sprouts. Fig. 5. 

 is a view on a large scale of the stalk with a part of the 

 outside or transparent portion of the globule attached to it. 

 Fig. 6. is a cross section of the stalk only, the whole of 

 which is one cell, i, in figs. 5 and 6, indicates the mass 

 which circulates round the cells. Fig. 7. A portion of a 

 cell of Chara vulgaris magnified, j j the internal membrane 

 in its two strips ; k k and 1 1 on the tubes, the lines to 

 which their edges adhered : these lines are indents on the 

 outside and ridges within, as shown in the section. Figs. 8 

 and 9. A portion of a cell of Nitella with the tender green 

 tissue floated out. Figs. 10 and 11. show portions of 

 the denser fluid detached, and forming large spherical balls. 

 This Plate is copied from Varley. 



PLATE LXII. 



Figs. 1 and 2. The segments forming the outer coating of the 

 globule magnified. Fig. 3. The filaments contained within 

 the globule. Fig. 4. The same more highly magnified, 

 showing the divisions into which each thread is divided, and 

 also the outlines of the animalcules contained singly in 

 each cell. Figs. 5 and 6. The animalcules more highly 

 magnified displaying the cilia by which their active move- 

 ments are effected. Figs. 7 and 8. Two of the peculiar 

 cells with the enclosed lateral circulating vesicle. 



