Note 93 — CHAP. III.
Reading edition
On the 18th, I sunk a bucket with a thermometer seventy fathoms below the surface of the sea, where it remained two minutes; and it took three minutes more to haul it up. The mercury in the thermometer was at 66, which before, in the air, stood at 78, and in the surface of the sea at 79. The water which came up in the bucket contained, by Mr. Cavendish’s table, 1⁄25, 7 part salt; and that at the surface of the sea 1⁄29, 4. As this last was taken up after a smart shower of rain, it might be lighter on that account. Captain Cook’s log-book.