indicated in our figure, as if it consisted of a common thin 

 channelled leaf, whose concavity is filled up by cartilaginous 

 matter. It is also worthy of remark, that in tlie lower 

 stratum the tissue below each vein is much more lax and 

 cavernous than that which is interspersed between the veins. 

 The stomates are small and imperfect, and occupy a double 

 or triple line in each furrow, lying concealed among the 

 scurfiness. 



