168 JOURNAL OF THE [jllly> 



devised and exhibited by him, illustrating his remarks by draw- 

 ings on the black-board. 



Dr. Holman said that the old fashioned concave slide allowed 

 speedy evaporation, but on his slide Protococcus may be kept 

 alive many days ; Ainaba, three weeks ; and Bacteria for six 

 months. In the minute canal, too inch wide and lAff 

 inch deep, between the two concavities with shallow 

 margins in his slide, blood corpuscles may be 

 caused to flow in either direction, to roll over, or to stand 

 on edge by the warmth of the hands of the operator, brought 

 towards the stage of the microscope at a distance of about six 

 inches. 



On motion, the thanks of the Society were tendered Dr. 

 Holman for his exhibit and explanation. 



Meeting ok May 4Th, 1888. 



The President, Mr. Charles F. Cox, in the chair. 

 Forty-six persons present. 



OBJECTS EXHIBITED. 



1. The living Beetle, Zopherus, mexicanus, Sol., " Makeche." 



2. The mandibles of the dead Beetle. 



3. Metal cover, in which the Beetle had cut and enlarged the 

 holes made for ventilation. 



4. The metal cuttings. 



5. Diagrams of the head and mandibles of the Beetle, and 

 photographs of the cuttings, etc. 



These five exhibits were by Mr. F. VV. Devoe, in illustration 

 of his Paper, read at this meeting. 



6. Fore leg of the Beetle, Harpalus Pennsylvanicus, Deg., 

 showing the " Brush and Comb :" by J. L. Zabriskie. 



7. Larva of Psephenics Lecontei, Hald. (an aquatic Beetle), 

 found at Delaware Water Gap : by A. Woodward. 



8. A collection of Beetles fi;om Yucatan : by Edgar J. 

 Wright. 



9. A collection of Beetles from New York City : by Edgar 

 J. Wright. 



