L|A|N|T|E|R|N 
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 
3 ‘ 
Halley’s Comet 
taken at intervals from September 1909 to July 1910. Also 
copies from old prints and drawings made at previous returns. 
Photographs of 
Saturn, Mars, and Jupiter 
recently obtained with the 40-inch telescope by Professor 
Barnard. 
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 
