38 MISSOURI BOTANICAL GARDEN BULLETIN 
60° should be allowed, but copious quantities of water should 
be applied throughout the growing season and especially 
when the flower spikes begin to show color. Generally, three 
months are required to bring the plants into full flower. 
Division of the clumps after forcing and growing them 
on in a cool place in the free ground outdoors for a year will 
produce new plants ready for forcing the year following. 
Astilbe is singularly free from attacks of diseases and insects. 
NOTES 
Mr. W. S. Wells spoke on “Thrift Gardens” at the Car- 
negie Library, Belleville, Illinois, March 18. 
Dr. George T. Moore, Director of the Garden, gave a talk 
before the St. Louis Garden Club, March 12, on “Lawns.” 
Mr. Alexander Lurie, Horticulturist to the Garden, spoke 
on “Thrift Gardens” at the Wellston High School, March 8. 
Mr. F. S. Collins, of Boston, is spending some time at the 
— working over the collection of algae in the her- 
arium. 
An illustrated lecture on “Tree Surgery’ was given be- 
fore the St. Louis Gardeners’ Club, March 6, by Mr. Alex- 
ander Lurie. 
Dr. Norma E. Pfeiffer, of the University of North Da- 
kota, has resumed at the Garden her monographic studies 
of the genus Isoetes. 
Visitors to the Garden during March included Mr. J. F. 
Collins, Forest Pathologist, U. 8. Department of Agriculture 
and Demonstrator, Brown University, Providence, Rhode 
Island; and the Rev. John Davis, of Hannibal, Missouri. 
On March 28 fifty students from the St. Louis College of 
Pharmacy, accompanied by Professor Hemm of that insti- 
tution, visited the Garden, and were conducted through the 
greenhouses and grounds by Mr. George H. Pring, Flori- 
culturist to the Garden. 
