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REPORT OF THE AUTUMN MEETING 
The following motion was offered: 
Moved: That the Home Secretary be requested to transmit the thanks of the Academy 
to the President and Trustees of Johns Hopkins University, the members of the Johns Hop- 
kins Club and the members of the Academy resident in Baltimore serving as the local com- 
mittee, for the courtesies extended to the members of the National Academy of Sciences at 
the Autumn Meeting, 1918. (Adopted.) 
SCIENTIFIC SESSIONS 
Three public scientific sessions were held on November 18 and 19 at which 
the following papers were presented. 
C. G. Abbot: Cloud reflection and the albedo of the earth and Venus. 
A, H. PruND (introduced by J. S. Ames): Colorimetry of white surfaces. 
F. W. Clarke and G. Steiger: The inorganic constituents of lobster shells. 
R. W. Hegner (introduced by H. S. Jennings) : Quantitative relations between chroma- 
tin and cytoplasm in the genus Arcella, with their relations to external characters. 
D. R. Hooker (introduced by W. H. Howell): The physiological effects of air-con- 
cussion. 
W. H. Howell: Two new factors in blood coagulation. 
C. B. Davenport and Albert G. Love: Comparative morbidity of white and colored 
troops. 
A. G. Webster: Theory of wind instruments. 
A. G. Webster: On the ballistic resistance function. 
A. G. Webster: On the dynamics of the rifle fired from the shoulder. 
G, P. Merrill: Second report on the researches on the chemical and mineralogical 
composition of meteorites. 
W. E. Dandy (introduced by W. S. Halsted) : Hydrocephalus: experimental and clinical 
study. Illustrated. 
W. S Halsted: Clinical and experimental observations in cases of arteriovenous and 
lymphatico-venous fistulae. Illustrated. 
W. E. Castle: Is the arrangement of the genes in the chromosome linear? Illustrated. 
E. F. Smith: Cause of Phyllomania in Begonia. Illustrated. 
W. G. MacCallum (introduced by H. S. Jennings) : Recent epidemics of pneumonia in 
army camps. Illustrated. 
G. A. Bliss: Differential corrections of ballistics. 
S. B. Wolbach: Some results of studies of Influenza at an army camp. 
V. C. Vaughan: Communicable diseases in an army camp. 
R. W. Wood: Physiological effects of light of short wave-length. 
*G. N. Lewis: Kinetics and thermodynamics. 
* A. O. Leuschner: Perturbations and tables of the minor planets discovered by James 
C. Watson, Part II. 
*C. E. Van Orstrand: Mathematical tables. 
*F. Slate, Jr.: Biography of Eugene Waldemar Hilgard. 
* W. W. Campbell: Biographical memoir of George Davidson. 
*C. R. Cross: Biographical memoir of James Mason Crafts. 
*T. D. A. Cockerell: Biographical memoir of Alpheus Spring Packard. 
* F. Slate, Jr.: Biographical memoir of Eugene Waldemar Hilgard. 
*The asterisk denotes presentation by title. 
