OP GLASS, AND THE EESISTANCE OP GLASS VESSELS TO COLLAPSE. 
Experiment 3. 
Diameter . . . . = • 0-69 inch. 
Area 0'3739 square inch. 
Height I’O inch. 
Fractured with 11,465 lbs. = 30,661 lbs. per square inch. 
Crushed with 13,033 lbs. =34,854 lbs. per square inch. 
Experiment 4*. 
Diameter 0‘70 inch. 
Area 0-3848 square inch. 
Height 1-55 inch. 
Crushed suddenly with 5193 lbs. = 13,494 lbs. per square inch. 
Experiment 5. 
Diameter 0-83 inch. 
Area . . . . • • • 0-541 square inch. 
Height I'O inch. 
Crushed suddenly with 11,241 lbs. = 20,775 lbs. per square inch. 
Experiment 6. 
Diameter . . . . . . 0-68 inch. 
Area 0-3631 square inch. 
Height 2-05 inches. 
Crushed with 11,913 lbs. = 32,803 lbs. per square inch. 
Green Glass Cylinders. 
Experiment 7. 
Diameter 0-77 inch. 
Area 0-466 square inch. 
Height I'O inch. 
Fractured with 6933 lbs. = 14,888 lbs. per square inch. 
Crushed with 10,516 lbs. =22,583 lbs. per square inch. 
Experiment 8. 
Diameter . . . . . . 0-76 inch. 
Area 0-454 square inch. 
Height 1-5 inch. 
Fractured with 8126 lbs. = 17,883 lbs. per square inch. 
Crushed with 15,891 lbs. = 35,029 lbs. per square inch. 
219 
This experiment is so evidently anomalous, that there can be little doubt that the bedding surface 
not parallel ; hence this result is omitted in the following averages. 
