SEPTEMBER 13, 1918] 
time as to which of these explanations will 
prove to be the correct one, we can at least be 
certain that the living corpus luteum has the 
function of inhibiting ovulation and of being 
a decisive factor in the mechanism of the sex- 
ual cycle. 
Leo Lors 
DEPARTMENT OF COMPARATIVE PATHOLOGY, 
WASHINGTON UNIVERSITY MerpicaL ScHOOL 
THE OHIO ACADEMY OF SCIENCE 
Tue twenty-eighth annual meeting of the Ohio 
Academy of Science was held at Ohio State Uni- 
yersity, Columbus, May 30 to June 1, 1918, under 
the presidency of Professor Francis L. Landacre. 
Forty-seven members were registered as in at- 
tendance; ten new members were elected. 
It was reported by the trustees that Mr. Emer- 
son MeMillin, of New York City, had again con- 
tributed two hundred and fifty dollars to the re- 
search fund of the academy. 
War conditions were noticeable in a somewhat 
reduced attendance, as well as in a suggestion of 
the trustees that a part of the research fund be 
invested in Liberty Bonds—a suggestion enthusi- 
astically endorsed by the academy. 
The following resolution was also adopted, rela- 
tive to the study of German in the colleges: 
The Ohio Academy of Science places itself on 
record as deprecating the suppression of the study 
of the German language in the curricula of some 
of our colleges. 
The study of German should be continued not 
only by reason of its direct utility to our troops 
abroad, but also because it is fundamentally neces- 
sary to science and productive scholarship. 
It is not the language, but Prussian ideas, which 
are antagonistic to the Allied nations; and any 
action which prevents the efficient development of 
scholarship and science, and of the industries de- 
pendent upon them, will prove advantageous to our 
enemies, 
After adjournment of the formal sessions, the 
botanists and zoologists made a short auto excur- 
sion to the picturesque and ecologically interesting 
Sugar Grove region, and the geologists took a 
longer trip for the study of the rock series (Niag- 
ara to Carboniferous) and ‘topography between 
Hillsboro and the Scioto River. Both excursions 
were eminently successful. 
Officers were elected as follows: President, M. 
M. Metcalf, Oberlin Oollege. Vice-presidents: 
Zoology, R. A. Budington, Oberlin College; Botany, 
C. E. O’Neal, Ohio Wesleyan University; Geology, 
G. F. Lamb, Mt. Union College; Physics, S. R. 
SCIENCE 
277 
Williams, Oberlin College; Medical Sciences, Er- 
nest Scott, Ohio State University. Secretary, E. L. 
Rice, Ohio Wesleyan University. Treasurer, J. S. 
Hine, Ohio State University. 
The scientific program was as follows: 
PRESIDENTIAL ADDRESS 
The origin of the cerebral ganglia of the verte- 
brates: Proressor F. L. LAaNpacre, Ohio State 
University. 
SYMPOSIUM ON SCIENCE AND THE WAR 
The work of the ground schools in the training 
of the air forces of the United States: Proressor 
F. C. Buaxr, Ohio State University. 
Modern methods of plant disease control: Pro- 
FEssor W. G, Stover, Ohio State University. 
Psychological tests in the army: CAPTAIN 
Grorce F. Arps, Ohio State University. 
Methods of teaching the theory of flight in 
schools of aeronautics: Proressor H. C. Lorp, 
Ohio State University. 
Topography and the war on the western front: 
Proressor T. M. Hitts, Ohio State University. 
The newer demands on physics and physics 
teachers due to the war: Proressor E. H. Joun- 
son, Kenyon College. 
PAPERS 
A peculiar habit of the rusty grackle: EDWARD 
L. RIcE. 
Notes on distribution of North Atlantie Bryozoa: 
RayMonD C, OSBURN. 
Economic value of the Ephemerida: Cuas. P. 
Fox. 
Remarks on leaf hoppers of Hawaiian Istands: 
HERBERT OSBORN. 
The fauna of a series of rock-bottomed ponds: 
F, H. Krecker. 
The habits of the folding-door spiders: W. M. 
BaRROWS. 
The subterranean life of meadows and pastures: 
HERBERT OSBORN. 
Opalina and the origin of the Ciliata: MAYNARD 
M. MerTcatr. 
The bryozoan gizzard: RaymMonp C. Ospurn. 
Free-swimming larval colonies of Pectinatella 
from Black Channel, Cedar Point: STEPHEN R. 
WILLIAMS, 
Anatomy of Echinorhynchus sp.: C. F. Me- 
KANN, JR., introduced by STEPHEN R. WILLIAMS. 
The effect of certain ductless gland extracts on 
plant tissues: R. A. BUDINGTON. 
Our knowledge of Ohio Crustacea: Raymonp C. 
OSBURN. 
