eriod of observation. When we compare this path tion of liquid air to practical refrigeration, on a scale cooler of very cold air, expanded to a pressure less than with the entire breadth of country over which the sufficiently extensive to furnish results definite and normal by the suction of birds… … lates them from external ly a strange bird is seen flying with a flock of to- heat, so that no especial tally different species. packing is required, as is This field of night study, so full of novelty and in- valuable as data for future operations, will be watched necessary in all other liqu.d air…
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