1881. ] Recent Literature. 887 
the butterfly mind of to-day differs in some respects from the 
mental traits of primeval butterflies, which had a different envi- 
ronment, different food plants and different enemies, and which 
must have practiced different arts and stratagems in their strug- 
gles for life from those of their descendants ? 
7, Departmeut of the Interior. U. S. Geographical and G “ih é 
Rocky Mraussie adie J. W. PowELt in charge. Re on the Geology and 
rees of the ., 
