PROCEEDINGS. 
509 
The relative abundance of the chemical elements, by F. W. 
Clarke. . 12, pp., $0 05 
Assumption and fact in the theories of solar and stellar 
proper motions, by J. R. Eastman. 30 “ 15 
Hurricanes in the Bay of North America, by Everett 
Hayden. 17 “ 10 
The mineral composition and geological occurrence of cer¬ 
tain igneous rocks in the Yellowstone National Park, by 
J. P. Iddings. 30 “ 15 
The evolution of serials published by scientific societies, 
by WJ McGee. 26 “ 15 
On certain peculiar structural features in the foot-hill region 
of the Rocky Mountains, near Denver, Colorado, by G. H. 
Eldridge. 28 “ 15 
The progress of meteoric astronomy in America, by J. R. 
Eastman. 84 “ 40 
Money fallacies, by C. E. Dutton. 26 “ 15 
Mohawk lake beds, by H. W. Turner. 26 “ 15 
Constitution and origin of spherulites in acid eruptive 
rocks, by Whitman Cross. 34 “ 20 
Spherulitic crystallization, by J. P. Iddings. 20 “ 10 
Obituary notices. 32 “ 15 
Proceedings. 154 “ 50 
The price of volume XI, unbound, is $2.50; bound, is $3.00. 
Applications for purchase should be made to Mr. W. C. Winlock, Secre¬ 
tary of the Society, Smithsonian Institution. 
Members desiring to take advantage of this arrangement for binding 
should, after seeing that their set is complete, deliver it to Mr. Marcus 
Baker, United States Geological Survey, as soon as practicable and not 
later than May 15, 1892, arranged in order, tied together and clearly 
marked with the name and address of the owner. A blank label for this 
purpose is enclosed. If the volume is to be sent out of the city the cost of 
carriage must be paid by the owner of the volume. 
The binders will deliver the bound volumes to Mr. Baker, from whom 
members will receive them. 
For the benefit of those members who may prefer a different binding 
from that adopted by the committee, the binders are ready to make 
special arrangements. Such arrangements, however, must be made by 
each member on his own account. 
Robert Fletcher, Chairman , 
W. C. Winlock, 
Marcus Baker, 
Committee on Publications. 
Washington, D. C., April 21, 1892. 
Mr. G. M. Searle read a paper on A simple form of double 
image micrometer. 
It was discussed by Dr. Gould, and Messrs. Harkness, Paul, 
Mendenhall, Farquhar, Woodward, and Searle. 
67-Bull Phil. Soc., Wash., Vol. 12. 
