PERSPIRATION OF PLANTS. I9 



ducts, as they appeared to him in several species 

 of Dianthus, Begonia nitida, Crassula umbellata, 

 Orchis mascula, and Massonia scabra ; which 

 exhibit great variety in their construction. But 

 what merits particular attention are his figures of 

 pieces of cuticle of Doryanthes hastata Correa* 

 and of a fpecies of Hcemanthus, which being of a 

 thicker texture, exhibit a cellular substance of two 

 or three stories, not unlike a part of a honeycomb. 

 Each of the above described orbicular receptacles 

 communicates with another beneath it, but no 

 further communication with other receptacles is to 

 be seen. What appear to be vessels or ducts, as 

 described by Saussure and Hedwig, are, in Mr. 

 Bauer's opinion, nothing more than the edges or 

 remaining parts of the dissepiments of the cells in 

 the cuticle. He therefore denies the existence of 

 vessels going to the orbicular receptacles, unless 

 they are supposed to be within the substance of 

 the upper edge of the dissepiments. 



How far these observations are correct, and if 



* A new liliaceous plant, al'ove 15 feet high, from New Holland 

 described in the Transact. Linn. Soc. Vol. 6, p. alt. 



B 2 



