51 



The second case was that of Campanula rapunculoldes, 

 the latex of which being milky, is better suited for observa- 

 tion. In the hair of this plant was shewn the same reticu- 

 lated connection of the currents of latex as is observable in 

 the interior of the plant, whether near the focus of cyclosis 

 or in the cellular tissue. This circulation of a milky fluid 

 v/as in all respects the same as that observed in Commeli?ia, 

 Tradescantia, and other plants whose latex is not milky. 

 Thus all these acts of circulation take place in a system of 

 vessels in the form of a very fine network surrounding the 

 cells, and even traversing their interior in various directions; 

 and this allows us at once to distinguish cyclosis from the 

 rotation of homorganic plants. The former is never isolated 

 in a cell, but always forms a part of a reticulated system be- 

 longing to several cells. 



With regard to anastomoses in the laticiferous tissue, M. 

 Schultz referred to his numerous drawings for abundant 

 proof of their universal existence where cyclosis occurs. The 

 knowledge of this plexus throws great light upon the direc- 

 tion of thecurrents of cyclosis in the interior of the parenchyma 

 of living plants, where the sides of the vessels cannot be 

 distinguished any more than in animals, in which doubts 

 have been often entertained as to the existence of vessels in 

 the system of the surface. It may be as impossible in plants 

 as in animals to separate the vessels in every part, but there 

 is no reason why we should not take a part for the whole in 

 the one case as well as the other. 



In conclusion, the author expressed his belief that a 

 general law in the organization of plants, as in animals, con- 

 stitutes two great divisions in the vegetable kingdom — the 

 homorganic and the heterorganic — and that it is chiefly from 

 variations in the system of circulation that those internal 

 changes of organization takes place, the results of which are 

 the diflferent grades of developement in the natural divisions 

 of the vegetable kingdom ; while in the animal kingdom it 

 is principally on the nervous system that the general types 

 of natural divisions are founded. 



G. July, 1839. 



