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L|A|NIT|E/RIN 
SLIDES AND PRINTS 
of SPECIAL INTEREST at the present time, from 
recent astronomical photographs made at the 
Yerkes Observatory, can be supplied by 
The University of Chicago Press 
WE MENTION 
A fine Series of Photographs of 
Comet Morehouse 
taken by Professor Barnard. Stereograms (on paper or glass) 
of this comet and plates of its spectrum. 
Various Photographs of 
Halley’s Comet 
(Four of the early pictures, taken in September 1909, with two- 
foot reflector, are combined in one slide.) 
Saturn and of Mars 
recently obtained with the 40-inch telescope by Professor 
Photographs of 
Spectroheliograms of 
Sun-Spots 
showing vortices in the solar atmosphere. 
Spectrograms of Rapid Spectroscopic 
Binary Stars 
Catalogue, with appendices, referring to about 600 Astronomical 
Subjects, now available, will be sent free on request. 
Address Dept. P 
The University of Chicago Press 
Chicago New York 
