ELEVENTH ANNUAL REPORT OF THE DIRECTOR. 21 
At the beginning of the College year 1899-1900, Mr. 
Herbert F. Roberts was appointed Instructor in Phanero- 
gamic Botany, in place of Mr. W. H. Rush, who resigned 
his position in the spring, after four years of efficient serv- 
ice. Several special students and candidates for advanced 
degrees have been in residence and have made use of the 
facilities of the laboratory, and at the commencement exer- 
cises of June, 1899, the degree of Doctor of Philosophy was 
conferred by the University on two of these persons, — Pro- 
fessor Louis H. Pammel of the Iowa Agricultural College,* 
and Mr. Hermann von Schrenk of Washington University.f 
Very respectfully, 
WILLIAM TRELEASE, 
Director. 
* Dr. Pammel’s thesis, entitled Anatomical characters of the seeds of 
Leguminosae, chiefly genera of Gray’s Manual, was published as vol. 9, 
no. 6, of the Transactions of The Academy of Science of St. Louis (pp. 
91-273. pl. 7-35). 
; Dr. von Schrenk’s thesis, entitled A disease of Taxodium distichum 
known as peckiness, also a similar disease of Libocedrus decurrens known 
as pin-rot, appears in the present volume (infra, pp. 23-77. pl. 1-6). 
din os at a ig a ee ee aati * pce LE Sa eS ee SO ERIS LS ee 
