REPORT, 
OF THE 
THIRTIETH ANNUAL MEETING 
OF 
The Ohio Academy of Science 
The Thirtieth Annual Meeting of the Ohio Academy of 
Science was held at Ohio State University, Columbus, Ohio, 
May 14 and 15, 1920, under the presidency of Professor 
Frederick C. Blake. Sixty-nine members were registered as in 
attendance; thirty new members were elected. 
GENERAL PROGRAM. 
Fripay, May 14. 
11:00 a. mi—Business Meeting. 
12:30 p. mi—Luncheon. 
2:00 p. mu—Reading of Papers in General Session. 
3:30'Pp. mw—Lecture by Professor Dayton C. Miller, Case School of 
Applied Science, Cleveland, on ‘‘ Photographing Sound 
Waves from Large Guns and Projectiles.” 
4:30 p. m.—Reading of Papers in Sectional Meetings. 
6:00 Pp. m.—Dinner. 
7:30 Pp. m.—Address by the President of the Academy, Professor F. C. 
Blake, Ohio State University, Columbus, on ‘‘The 
Einstein Theory of Relativity and Gravitation.”’ 
8:30 p. mi—Demonstrations and Social Gathering. 
SATURDAY, May 15. 
9:00 a. mi—Adjourned Business Meeting. 
10:00 a. mi—Reading of Papers in Sectional Meetings. 
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