1 04 DENSITIES OF OXYGEN AND HYDROGEN 



oxvgeii was nearly half \s itiidiawii ; the globes were tberefure weiglieil, one agaiust 

 the counterpi>ise foi- the empty globe and the other against the oounteriioise for the 

 full globe, and a correction conii)uted for the difference of volumes; the two cor- 

 rections nearly balanced each other. In the eighth and ninth experiments, the 

 globes, both full and half empty, were weighed against the counterpoise of the 

 empty globe, and corrections computed ; the connter[>oises for the filled glolies had 

 suffered injury. In the last three experiments, the globes were closed by fusion ; 

 they were weighed when half empty against the counterpoises of the full globes, 

 and coriections computed for the difference in volumes. 



1(1. SYNTUKSIS OF WAIKK. WEKillING TIIK I'AM.ADIl M AITKH A COMBITSTION. 



The volume of the tube containing palladium was determined by hydrostatic 

 wei<'hings. In the cases where the tube was provided with a sto[icock, it was im- 

 mersed oidy to a certain mark at this second hydrostatic weighing. AVhen no 

 stopcock was used, the tube was suV^merged. In all cases, the volume of the [>art 

 which had Iteen fused off' was determined from its weight and specific gravity. 



From the change in the volume of the tube a correction to the observed weight 

 was computed. These ex[)eriments were made before the construction of the 

 system of fla.sks for making equal the volumes of the masses placed on the opposite 

 pans of the balance. 



11. — SYNTHESIS OF WATKU. Kl DIOMETUIC ANALYSIS OI" TIIK HKSIDUE LEFT 



UNCO.MI5INED. 



The gas extracted from the apparatus after the combustion was ended, was 

 measured and analyzed. Only one point needs mention. 



In some experiments sonie carbon dioxide was found. The amount was not 

 large, but the question as to its origin was an important one. If it came from car- 

 bon weighed with the hydrogen, the experiment was valueless. Tln' prol)ability 

 was that it came from the asbestos, where the combustion was carried on for a few 

 seconds. This asbestos had to be handled in the construction of the tubes, and it 

 was not easy to free it fiom dust by ignition, as, after ignition, my sample was not 

 well suited for its use. To settle the (juestion, some two or three huiuli'ed grammes 

 of water were formed in a comV)Ustion appaiatus of the same kind, l)Ut without 

 wei'diing the gases introduced. The water produced was allowed to fiow 

 out, as formed, by a tube fused to the bott(jm- of the appaiatus ; it wjvs kept from 

 contact with the atmosphere. In this case theie was no asltestos, but the hytlrogen 

 was the same as that used in ,ill llic cxpcrinn'nts. 



