BACK VOLUMES OF PSYCHE 
The Cambridge Entomological Club is able to offer for 
sale the following volumes of Psyche. Those not mentioned 
are entirely out of print. 
Volumes 2, 3, 4, 5, 6, 7, 8, 9, each covering a period of three 
years, $5.00 each. 
Volumes 10, 12, 14, 17, each covering a single year, $1.00 each. 
Volumes 18, 19, 20, 21, 22, 23, 24, 25, 26, each covering a single 
year, $1.50 each. 
Volumes 27 to 53, each covering a single year, $2.00. 
Volumes 54 to 56, each covering a single year, $3.00. 
Orders for 2 or more volumes subject to a discount of 10%. 
Orders for 10 or more volumes subject to a discount of 20%. 
All orders should be addressed to 
F. M. Carpenter, Editor of Psyche, 
Biological Laboratories. 
Harvard University, 
Cambridge, Mass. 
