90 MINTTHS or TMlv INSTITUTK. 



" Summer Botani/inj; in ihe Mountains of New York and 

 New Hampshire, " illustrated with specimens, by George B. 

 Kaiser. 



December 22, 1910. — Adjourned meeting. Illustrated 

 lecture, "St. Petersburg and Moscow," by S. L. Schumo. 

 The main subject was followed by illustrations of water ero- 

 sion, commonly known as " pot holes." 



J.\Nr.\RY 5, 191 1. — Regular monthly meeting, with Vice 

 President Henry L. Broomall in the chair. Reports of officers 

 and routine business. C. K. Ogden exhibited Belemites from 

 the Cretaceous formation of Mullica Hill, New Jersey. Albert 

 S. Barker showed a spectroscope with bisulphide of carbon 

 prism, giving wide dispersion of color and continuous spec- 

 trum, absorption bands and line spectra. Adjourned. 



J.\XUARY 12, 1911. — Adjourned meeting. Lecture, "Mol- 

 ecular Masses of Liquids," illustrated by charts, by Dr. 

 George H. Meeker. 



