(131) 
for the F2 generation of various varietal and specific 
hybrids. I was unable, during the past summer, to leave 
the Garden for field study on the natural distribution of 
types of Hibiscus Moscheutos and H. ocultroseus, which is 
highly desirable and for which J already have your per- 
mission. I should like very much to plan for some such 
observation during the coming summer. 
Observations have been continued on the variations that 
appear in the tulips grown for display. A preliminary 
morphological and cytological study of the cell conditions 
in the various stages of color development has been made, 
which promises interesting results. Material has also been 
supplied to Professor Gies and Dr. Horowitz for chemical 
studies of the flower pigments in tulips. 
Hybrids between species of Carex started two years agogrew 
luxuriantly during the year, but only one plant came into 
flower. The cytological study of various species of Carex 
and of their hybrids has been a special subject of investiga- 
tion by Mr. Faulwetter during the past year. 
Students and Investigators 
The following list includes the investigators who held 
research scholarships at the Garden, students originally 
registered at Columbia University and pursuing studies at 
the Garden, and tuition students of the Garden. For this 
year, all the last-named class also pursued some studies 
at Columbia University. 
*ALTENBERG, Epcar. A.M., Assistant in botany, Columbia 
Vv. 
Heredity of Primula and of various cereals. 
RTHUR, JosEPpH CuarLeEs. Sc.D., Professor of vegetable 
physiology and peony Purdue Univ 
Taxonomy of the Uredin 
Bargour, WILLIAM C B.S., Assistant teacher of biology, 
High School of Commerce, New York City 
Lichenolo 
*BERMAN, FLORENCE eke A.B., Teacher in Public School 
10, New York City 
Genetics. 
* Registered at Columbia University. 
{ Research scholarship. 
