29 



Mean 

 Corrected 



Mean, .0S9967, ± .coooii 

 Corrected, .0S9970, ± .000011 



In the second group of experiments, the hydrogen was weighed in 

 palladium before transfer to the cahbrated globe; and in weighing, the 

 palladium tube was tared by a similar apparatus ot" nearly equal volume 

 and weight. After transfer, which was effected without the intervention 

 of stopcocks, the volume and pressure of the gas were taken at the 

 temperature of melting ice. A preliminary set of measurements was 

 made, followed by three regular series ; of these, the first and second 

 were with the same apparatus, and are different only in point of time, 

 a vacation falling between them. The last series was with a different 

 api)aratus. The data are as follows, with the means as usual : 



