The Density, Compressibility and Atomic Weight of Nitrogen.

and Schlatter,10 0.00087; and is very near the average calculated by Pickering," -0.00094. With the density at one normal atmosphere, 1.42897, and the coefficient of deviation from Boyle's Law per atmosphere, -0.00092, the limiting value of molal volume is 22.4144 liters. The atomic weight of helium calculated with this value from the density previously found by us, 0.17846,2 is 4.0001, where the fourth decimal place is without especial significance. We are very greatly indebted to the Milton Fund for Research in Harvard University, to the BAcHi and WoLcoTT GIBBS FUNDS of the NATIONAL ACADEMY OF SCIENcEs and to the Cyrus M. Warren Fund of the American Academy of Arts and Sciences for generous assistance, without which this work would not have been possible.