1881.] Entomology. 323 
V. R. in Farmers’ Review. 
ON soME INTERACTIONS OF ORGANISMS.—We have received an 
advance copy ofa brochure with this title by Professor S. A. Forbes, 
extracted from Bulletin No. 3 of the Illinois State Laboratory of 
Natural History. It contains some thoughts and generalizations 
that have grown out of that writer’s studies on the food of birds, 
insects and fishes, and the interrelation and interdependence of 
these animals. Professor Forbes finds that it is extremely unlikely 
is is a conclusion which 
mies which shall best promote this common interest; therefore, 
