172 PROCEEDINGS OP THE AMERICAN ACADEMY 



The combustion was started at 11.25 a.m., and stopped at 6 p.m. 



Weight of P 2 5 tube, 



before combustion = 48.1795 h = 30.03 t = 1 6.5 



after " =48.1832 h = 30.00 *=18.0 



Gain in weight = 0.0037 — 0.03 + 1.5 



Weight of H 2 S0 4 tube, 



before combustion = 64.9625 h = 30.03 t — 16.5 



after " =67.6832 h = 30.00 <=18.0 



Gain in weight = 3.7207 —0.03 + 1.5 



Gain in weight of H 2 S0 4 = 3.7207 grams. 



P 2 0. = 0.0037 



.. 



Correction to vacuum = 0.0041 " 



3.7285 " 

 Correction for t and h, H 2 S0 4 = — 0.0002 " 



P 2 5 = - 0.0002 



Total H,0 formed = 3.7281 



u 



u 



Weight H taken = 0.4153 " 



Weight O combined = 3.3128 " 



Atomic weight of Oxygen = - — ' — = 15.954 

 %H = 11.139. % = 88.861. 



