. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology; Zoology. THE PHYSIOLOGY OF DEEP-SEA LIFE. 295 mouth of the flask by a close-fitting india-rubber stopper. The tube of the bulb has a lateral opening from an ingenious sUde - valve between the bulb and the flask. To the upper part of the bidb is attached a gas-tube with a double-ended pipette, in which a vacuum is formed by boiling out distilled water from the bulb, closing the upper end of the gas-tube, and then making a connection with the flask, which under the re- lieved pressure will allow the gas contained in the
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology; Zoology. THE PHYSIOLOGY OF DEEP-SEA LIFE. 295 mouth of the flask by a close-fitting india-rubber stopper. The tube of the bulb has a lateral opening from an ingenious sUde - valve between the bulb and the flask. To the upper part of the bidb is attached a gas-tube with a double-ended pipette, in which a vacuum is formed by boiling out distilled water from the bulb, closing the upper end of the gas-tube, and then making a connection with the flask, which under the re- lieved pressure will allow the gas contained in the sea-water to find its way into the gas- tube. This is then sealed at the other extremity, and the contents analyzed on shore. Dr. Jacobsen concluded from his analyses that the percent- age of oxygen in sea-water was practically invariable, the low- est and highest percentages be- ing and While this is undoubtedly true for lim- ited areas, the analyses by Dr. J. Y. Buchanan of the " Challenger " show that, under varied conditions of temperature, there was a somewhat wider range, — between 33 and 35 per cent, in round numbers. The pro- portion of oxygen being greatest on the surface, it begins at once to diminish rapidly till it reaches more slowly a minimum, at a depth of 300 fathoms ; and below this depth, its percent- age remains constant. This does not quite agree with Dittmar's results stated further on. The carbonic acid in the water was determined directly by dis- tilling in a current of air conveying the gas, and collecting the steam and carbonic acid in a vessel charged with baryta water. By adding to the water to be tested a measured quantity of acid. Fig. — Bunsen's apparatus, modified by Jacobsen and Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Harvard
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Keywords: ., bookauthorha, bookcentury1800, bookdecade1860, booksubjectzoology
