Morse.l 220 I Feb. 21, 
a valley when the ice moved in tli:it direction. 10. Eskers tend 
to give rise to secondary drainage effects, in ponds, swamps, and 
streams distributed along their flanks. 11. The typical eskers of 
southern New England are most easily explained by a subglacial 
origin, but segments occur where the cross-section departs from 
the limitations of the type and demands a channel open to the 
sky. 
Prof. E. B. Poulton spoke on theoiies of evolution.^ 
Profs. H. F. Osborn, C. S. Minot, E. S. Morse, and A. Hyatt 
took part in the discussion which followed. 
Genkkal Meeting, P^ebruary 21, 1S94. 
President W. H. Niles in the chair. One hundred and five 
persons present. 
It was announced that the following Corporate Members had 
been elected by the Council : Messrs. Frederick 8. Bennett, 
Robert P. Bigelow, Severance Barrage, Charles B. Davenport, 
John Hobbs, T. A. Jaggar, Jr., William Patten, and F. W. 
Russell. 
Prof. Charles R. Cross described and illustrated the physics of 
color mixture. 
Prof. E. S. Morse discussed a recent advance in color printing 
by a photomechanical process. 
The following papers were read : — 
SPHARAGEMON : A STUDY OF THE NEW ENGLAND 
SPECIES. 
HY ALBERT P. MORSE. 
I. Prefatory. 
The following pajier arose- from study of the New England 
Acrididae with a view to publication upon this part of the New 
England insect-fauna. 
^ This paper will he published at some future time. 
