Efficient electron-beam initiation of an atmospheric-pressure HF chain-reaction laser has been demonstrated. Intrinsic electrical efficiencies of up to 875% have been observed with laser output energy densities of up to 51 J/liter atm at low initiation levels. This result was obtained for a laser mixture containing H2:F2:He:O2 at mole fractions of 0.08:0.30:0.61:0.01. Laser output energy was extracted from a volume of 104 cm3.

Klaatscb, in 1899, does not seem to have recognized this (cf. Mittheilungen der Anthropologischen Gesellschaft in Wien, Band xxx. No. 1, Sitzungsberichte, s. 89). I think the conclusion that is best justified by the facts is this-viz., that Pithecanthropus erectus furnishes us with a likeness, if not a facsimile, of a phase in the evolution of the human form from that of a generalised primate mammal, and a phase, moreover, which is nearer the terminal human stage than that shown by any other primate form, whether anthropoid or lower, and whether recent or extinct.

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