(10 ) 
living plants, attention has been principally directed to the 
more accurate and critical study and arrangement of the col- 
lections already formed rather than to their increase, and 
satisfactory progress has been made along these lines. ‘The 
total additions aggregate 52,732 specimens, some 36,000 of 
which were obtained through our own system of exploration, 
the continuance ‘and expansion of which are undoubtedly the 
most satisfactory ways of increasing the collections in the 
future. 
The cases in the public museums are now of just about 
enough capacity to properly display the specimens installed 
without crowding ; the further natural growth of the collec- 
tion should soon be provided for by additional cases, which 
another city appropriation for construction would make 
possible. 
The increase of the herbarium was provided for by the con- 
struction of several cases, and several more are at present 
needed. 
Laboratories 
More use of the laboratories has been made by students 
pursuing original investigations under the direction of mem- 
bers of the staff than in any previous year, the number of such 
research students aggregating 53 and coming from 45 differ- 
ent institutions throughout the country. The report of the 
Assistant Director hereto appended presents details of this 
work. 
Lectures and Demonstration 
The Saturday afternoon lectures in spring and autumn 
were continued to increasing audiences. 
Under authority already granted me, it became possible in 
the spring to organize a series of lectures and accompanying 
demonstrations for the pupils and teachers of the public 
schools of the Bronx, supplementing and illustrating the na- 
ture study work of grade 4 B of the schools; g lectures were 
delivered between April 14 and May 23 to about 2,300 dif- 
ferent children and teachers. This work was again taken 
up in the autumn and 15 lectures and accompanying demon- 
