icith which Air rushes into a Vacuum. 



533 



these experiments I have met with some results which I 

 thought of sufficient importance to bring before the Society. 



The apparatus employed in this investigation consisted of 

 two strong cylinders of cast iron, shown in the engraving. 

 The small cylinder, A, had an internal capacity of 573 cubic 

 inches, while the large cylinder, B, had a capacity of 8459 



cubic inches, or about fifteen times the capacity of the cy- 

 linder A. To the top of this cylinder was fitted a syringe for 

 Phil. Mag. S. 5. Vol. 20. No. 127. Dec. 1885. 2 P 



