Guye and Moles' discuss surface condensation of moisture and other gases, and its effect upon the weights of substances weighed in the air, while Guyee emphasizes the bearing of this effect and of occluded gases upon the atomic weights of silver and other elements whose atomic weights have been found by reference to silver. Moles3 discusses critically the determinations of atomic weights published in 1916. Sears4 finds tantalum pentachloride unsuited for the very exact quantitative manipulation required for atomic weight experimentation. C

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