Contents : 



The Evolution of the Horse, . . . . Page 115 



By B. M. Underhill, V. M. D. 



Some Observations on Diatom Motion, - - " 128 



By T. Chalkley Palmer 



A Note on Spelling, By Henry L,. Broomall, - " 142 



Vacuum Tubes, By Carolus M. Broomall, - - " 148 



Minutes of Meetings, " 152 



Institute Notes, - - - - - - - " 154 



