(337) 
and in various hybrids with this species as a parent has 
been studied with reference to the influence on fertility. 
Field studies on the natural distribution of Hibiscus were 
deferred until another year, but correspondence with 
various botanists have revealed conditions that make such 
studies desirous, if not imperative, to the further prosecu- 
tion of this research. It is also highly desirable to grow 
further cultures that will enlarge the area of the Hibiscus 
plantation. 
Cultures of Verbascum Blaitaria have been grown for 
further study of the heredity of flower-color and of the 
conditions inducing fasciation. ‘These cultures have also 
been utilized for certain observations on phyllotaxy. 
Some progress has been made in the cytological study of 
the various forms of Plantago lanceolata with reference to 
the various grades of sex differentiation that here appear, 
and of Cichorium Intybus with respect to the behavior of 
pollen-tubes in cases of self-sterility and self-fertility. 
The hybrids between various species of Carex, noted in 
previous reports, bloomed profusely this year and seeds 
were obtained for an F, generation. Herbarium specimens 
were made for record and for study by specialists on Carex. 
Observations on variations appearing in tulips have been 
continued. Experiments have also been started to deter- 
mine the relation in tulips of the weight of bulbs to flower- 
ing and to depth of planting. Definite studies are also 
being made in pedigreed cultures on the behavior of tulip 
plants that came “blind” last year. 
Students and Investigators 
Professor Gies and Dr. Horowitz have continued to make 
chemical investigations of various plant pigments, especi- 
ally those of certain flowers and of the leaves of Coleus, 
material for which has been supplied from the Garden. 
Several visiting investigators have been in residence 
during a part of the year. Professor G. E. Stone spent 
several months in physiological researches. Dr. R. R. 
