118 VEGETABLE ORGANOGRAPHY. 



bladders of sea-weed; but their rigidity and regularity 

 leave me much in doubt with regard to the accuracy of 

 this analogy. 



The second kinds of bodies, situated in the cavities, 

 and which appear to make an integrant part of the 

 tissue, are composed of little round-stalked buttons, 

 which Kieser has discovered in the air cavities of Calla 

 JEt/tiopica, and which spring from their walls. The 

 function of these organs is wholly unknown. 



The peculiarity of these two classes of organs to the 

 plants we have mentioned would make us think that 

 their use is of little importance. 



CHAPTER XV. 



OF ARTICULATIONS AND DEHISCENCES. 



In the animal kingdom the articulations are complete 

 solutions of continuity between the solid parts which 

 form the frame-work destined to support the organs of 

 locomotion ; in plants, where there is no apparatus for 

 motion, that is to say, no muscles or bones, there cannot, 

 consequently, be articulations analogous to those of 

 animals. 



Those parts in plants are called Articulations, where, 

 at a certain period of life, solution of continuity naturally 

 takes place. It is to be remarked, that all the parts of 

 plants which naturally fall off are provided with articu- 

 lations, and that all those which are devoid of them die 

 after a certain time, and dry up and are destroyed piece- 

 meal, but are never detached in one whole piece ; this 



