33 
York City, and especially to Dr. Halsey J. Bagg, for supplying the 
radium preparations for this work. 
- Cooperation with Schools 
Attendance.—During the year 470 teachers brought nearly 2,000 
pupils to the Garden for lectures and class instruction and to view 
the collections in conservatories and grounds. This was an in- 
crease of nearly 2,000 over 1920. 
Distribution of Potted Plants—Special attention is here called 
to the distribution of potted plants to schools, as noted in the report 
of the curator of elementary instruction (p. 62). Every school 
class that visits the Garden for instruction now receives a potted 
plant to take back to the schoolroom. During 1921 over 1,500 
plants were thus distributed, and all of them were raised by the 
boys and girls in our children’s greenhouse, as a by-product of 
their instruction in plant propagation. 
Study matertal has been supplied to high schools when requested, 
and 358 Petri dishes have been filled with sterile culture media for 
use in connection with the study of germs. 
Seed Packets—There is a steadily increasing demand for packets 
of seeds for home planting by school children. In 1921, 130,890 
packets were sold—an increase of 2,350 over 1920. 
Public Instruction 
Courses and Registration.—Thirty-seven courses of public in- 
struction were offered during the year, in addition to our coopera- 
tive work with the schools, the school for gardeners, the children’s 
garden, and the educational work carried on in connection with 
our plantations, conservatories, herbarium, and library. Of these 
courses, 10 were for children, 10 for teachers, 9 for the general 
public (adults), and 8 for advanced students, including research. 
e total number registered in all classes was 3,537. 
Public Lectures.—Up to the present the giving of public lectures 
for adults has been a rather incidental feature of our educational 
work. Four lectures were given last April, free to the public, with 
a total attendance of 960. The attendance at lectures to children 
was 11,637. It is anticipated that this activity will be organized 
on a larger scale in 1922. 
