(33) 
embodied in a paper to be published by the American Geo- 
graphical Society in their Bulletin for January, 1906, and 
which is to be reprinted as Contribution 77 from the Garden. 
I have continued to act as a member of the Advisory Com- 
mittee, in charge of the Desert Botanical Laboratory of the 
Carnegie Institution at Tucson, Arizona. 
Respectfully submitted, 
D. T. MacDoueat, 
Assistant Director. 
