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. 
V olumes 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, eacli 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. 
