callosities upon the disk of the latter distinguish it positively. 

 In E. odoratissimum the disk is simply thickened and flat- 

 tened and gradually thins away towards the base ; in 

 E. qracile it is distinctly two-ribbed, and has two obsolete 

 teeth a little below the middle. 



The want of beauty in this plant is amply compensated 

 for by its delicious fragrance, early in the morning and at 

 night. It seems as if it were more terrestrial than epiphy- 

 tal, and grows freely in any light well drained soil. The 

 patch sent home by Mr. Lees consisted of a mass of pseudo- 

 bulbs nearly two feet in diameter. 



