&0 HEDWIG ON THE ORGANS OF 



correct, whether the same construction be found 

 in all plants, or only in some of the succulent, the 

 future researches of Mr. Bauer, or other natu- 

 ralists, cultivating this interesting part of phytology, 

 will determine. 



M. Decandolle, well known by his wor% 

 upon succulent plants, has also written an instruc- 

 tive paper upon those orbicular bodies, which he 

 calls les pores de l'ecorce des feuilles*. According 

 to him, they are never met with upon the nerves, 

 where the meshes of the net are narrower and 

 more elongated than in other placesf. The hairs, 

 on the contrary, are always placed upon the nerves 

 or their ramifications. He is of opinion that the 

 fibres of which the leaf-stalk consists, spread- 

 ing within the surface of the leaf, have their last 

 ramifications connected with the described pores. 

 As a proof of this he refers to the leaves of 



* Extrait (Tun mcmoire stir les pores de 1'Ecorcc des Feuilles par lc 

 Citoyen Decandolle, lu a la classe physique & mathematique de l'lnstitut 

 national. Journ. de Physique Vol. 53. p. 130. 



f In a drawing which Mr. Bauer has made of the cuticle of the leaves 

 of Massonia hespida, the thornlikc cxcrescencies appear to be without 

 those orbicular bodies, but furnished with the same net nearly up to 

 their tops, the meshes becoming gradually narrower. . 



