39 
Pollardi, O. stricta, O. Drummondit), while one species (Opuntia 
Dillenii) is widely distributed in tropical America. Two species 
(Opuntia lata, O. Pollardi) are typical of inland pinelands. One 
species (Opuntia ammophila) is confined to the ancient quiescent 
sand-dunes or scrub, and the adjacent prairies and pinelands, 
while two species (Opuntia austrina, O. Drummondii) occur on 
the active sand-dunes and in the inland pinelands. Three 
species (Opuntia kevensis, O. Dillenii, O. sebrina) are typically 
maritime and grow almost always in hammocks or on coastal 
dunes near hammocks. 
Among the native species three (Opuntia lata, O. Pollardi, O. 
Drummondii) are prostrate, while six (Opuntia austrina, O. 
ammophila, O. Keyensis, O. Dillenii, O. stricta, O. sebrina) are 
erect, some of them merely bushy, others tree-like. 
Joun K. SMALL. 
DR. HENRY ALLAN GLEASON APPOINTED FIRST 
SSISTANT 
Dr. Henry Allan Gleason has been appointed the First Assistant 
of the Director-in-Chief, succeeding Dr. W. A. Murrill, who has 
been transferred to the new position of Supervisor of Public 
Instruction. 
Dr. Gleason is 37 years old; he was graduated from the Uni- 
versity of Illinois in 1901, received his Master of Arts degree 
from his alma mater in 1904, and his degree of Doctor of Phi- 
losophy from Columbia U niversity in 1906. He studied at the 
New York Botanical Garden in 1903, 1906, 1913, and again in 
1918, and at the Missouri Botanical Garden in 1y04. From 1go1 
until t910 he served as assistant and later as instructor in the 
botanical department of the University of Illinois, except during 
one year, while he was a fellow of the Ohio State University. 
Since 1910 he has been on the faculty of the University of Mich- 
igan, first as Assistant Professor of Botany, and later as Asso- 
ciate Professor, and since 1915 he has been Director of the Bo- 
tanical Garden and Arboretum of that institution. Dr. Gleason’s 
