that of nocturnal which may be composed of any desired material. bird flight, and the results are told by Mr. O. G. Lib- This in turn is surrounded by another air space be- by, in The Auk. tween the insulating layer and the external vessel. A A six-inch glass at the Washburn Observatory, over-… … June 22, a trial was made, steam was turned on, and the compressors started. In about two hours after, liquid air was produced in such a flowing current have practically the same temperature quantity that it flowed from the outlet in almosta con- tinuous stream. This was kept up for nearly five in…
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