36) 
I have continued my studies on the grasses of North Amer- 
ica, in addition to work done by me in the cultivated collec- 
tions, especially in the orchid and pineapple families; the 
increasing size of the Garden collections in these families, 
due largely to explorations carried onin the American tropics, 
makes this work of great interest. 
Respectfully submitted, 
GrorceE V. Nasu, 
flead Gardener. 
