MINUTES OF THE INSTITUTE. 89 



the Department of Physics, University of Pennsylvania. The 

 lecture was accompanied by many interesting experiments. 



December 23, igog. — Adjourned Meeting. Illustrated 

 lecture, "Cement; Its History, Manufacture and Use," by 

 Prof. Claude Berry, of the Department of Civil Engineering, 

 University of Pennsylvania. 



January 6, igio. — Regular monthly meeting, with Vice 

 President Henry h- Broomall in the chair. Reports of com- 

 mittees and officers and miscellaneous business. The scien- 

 tific portion of the meeting was devoted to a lengthy discus- 

 sion upon astronomical subjects, covering comets, central 

 forces, spectroscopy, etc. Meeting adjourned. 



January 13, igio. — Adjourned meeting. Lecture, 

 " Animal Behavior," by Dr. H. G. Kribbs, of the University 

 of Pennsylvania. 



Jannuary 27, 19 10. — Adjourned meeting. Lecture, 

 " Types of Vegetation in North America," by Dr. John W. 

 Harshberger, of the University of Pennsylvania. 



