( 40 ) 
Dr. Marshall A. Howe, Curator, continued the develop- 
ment of the collections of algae and hepatics. He collected 
marine algae during part of January in Jamaica and spent 
part of November and all of December exploring the more 
southern portions of the Bahamas, and throughout the year 
continued his studies on the North American marine algae. 
Some results of these studies were published in several papers. 
Dr. Howe continued to edit TorREYA with the coéperation of 
Dr. Philip Dowell. 
Dr. Arthur Hollick, Curator, has had charge of the collec- 
tion of fossil plants. He prosecuted field work at Kreischer- 
ville, Staten Island, N. Y., investigating the Cretaceous flora 
in codperation with Professor Edward C. Jeffrey, of Harvard 
University. Dr. Hollick, with the voluntary assistance of 
Mr. Edwin W. Humphreys, a former student at the Garden, 
worked out the synonymy of the species to be represented in 
the new exhibition cases in order that the specimens may be 
rapidly and correctly labeled. 
Dr. P. A. Rydberg, Curator, has taken care of the collec- 
tion of flowering plants. He has also continued the prepa- 
ration of the manuscripts both of the Rosaceae for a forth- 
coming part of the North American Flora and of his Flora 
of the Rocky Mountains. Dr. Rydberg published severa] 
papers on North American plants and two addresses which he 
delivered in connection with celebrations commemorative of 
the two hundredth anniversary of the birth of Linnaeus. 
r. R. S. Williams, Assistant Curator, was occupied 
during the early part of the year in arranging and incorpo- 
rating the Leighton and Hasse herbaria of lichens with the 
permanent collections of the Garden, and also in studying va- 
rious West Indian collections of lichens. During the rest of 
the year Mr. Williams completed his studies on the second 
part of a large collection of Bolivian mosses, and also studied 
several smaller collections from various parts of tropical 
America. He studied the genera Alacromsrtrium, Campy- 
lopus and various genera belonging to the family Neckera- 
ceae for the preparation of manuscript for forthcoming parts 
of the North American Flora. 
