MINUTE STRUCTURE. 



67 



where the hygrcniietric coiulitioii.s of tlie atmosphere are fur the greater 

 part of the year the most intense. Its leaf structure is thence adapted 

 to these conditions ; a thick cuticle and closely packed epidermal cells 



X 4-0 



Fig. 10. Fragineiit of transver.se section of leaf of CuiH-ipediam niveum. 3a, elongated water cells ; the other 



numerals as before. 



(From the Gardeners' Chronicle.,/ 



and numerous underlying elongated cells approaching the palisade form 

 implying more or less exposure to a vertical sun, and also ample 



Fis. U. Transverse section of leaf of dipriiKdhi.n Insigac at the niidrilj, x 2.0. The numerals as before. 



storage for water. The appearance of isolated bast-like fibre near the 

 upper epidermis is significant of high development. 



Cypripedium. — Fig. 10, Gijpripediuin iiire/im. The layer of long 



vertical prismdike cells underlying the epidermi.s might be mistaken 



