Down, November 5th, 1880.
On reading over your excellent review (300/1.

See "Nature," November 4th, 1880, page 1, a review of Volume I.of the publications of the "Challenger," to which Sir Wyville Thomson contributed a General Introduction.) with the sentence quoted from Sir Wyville Thomson, it seemed to me advisable, considering the nature of the publication, to notice "extreme variation" and another point.

Now, will you read the enclosed, and if you approve, post it soon.

If you disapprove, throw it in the fire, and thus add one more to the thousand kindnesses which you have done me.

Do not write: I shall see result in next week's "Nature." Please observe that in the foul copy I had added a final sentence which I do not at first copy, as it seemed to me inferentially too contemptuous; but I have now pinned it to the back, and you can send it or not, as you think best,--that is, if you think any part worth sending.