(46) 
Further plantings of Hibiscus and Phlox were not made 
during the year. The greater number of Hibiscus plants, 
comprising pedigreed lines of pure species, of varieties and 
of inter-varietal and inter-specific hybrids, have been 
turned over to you for special display plantings. One 
series of plants grown from seed collected near Washington, 
D. C., and reported to be Hibiscus incanus, bloomed during 
the summer and exhibited striking resemblance to H. 
oculiroseus in respect to flower and pod characters. Further 
field studies of Hibiscus are desirable especially in the 
regions of southern and western range. 
Under your general supervision I conducted during the 
summer and autumn an experiment to determine the effect 
of potash on the growth of beans. The results have been 
submitted to you and were printed in the December number 
of the Journal. 
Special plantings of tulips for continued study of rots, 
blindness, and abnormal growth suffered severe injury 
through depredations of pine mice. General observations 
were made, as in previous years, of the performance of 
tulips in the display plantings. Several problems in tulips 
of considerable practical interest await further study. 
In general my studies during the year have been more 
intensive than extensive. This has reduced the number 
of plants grown, the space utilized in greenhouse and expe- 
rimental plots, and the amount of labor involved. 
During the year four papers embodying results of re- 
searches have appeared in various scientific publications 
and two descriptions of Hibiscus species have been written 
for Addisonia. The final and complete report of the 
statistical studies of flower number in Cichorum Intybus, 
which have been in progress from 1912 to 1916 inclusive, 
was one of these papers, and in the preparation of this 
Miss Helene Boas was a joint author. The record of 
students and investigators at our garden (1897-1918) 
was also revised to date and was published in the Journal 
for October. 
