Believe me, I have not forgotten, nor ever shall forget, your kindness to me at a time when a little appreciation and encouragement were more grateful to me and of more service than they will perhaps ever be again. I have done my best to justify you.

I send copies of all the papers I have published with one exception, of which I have none separate. Of the Royal Society papers I send a double set. Will you be kind enough to give one with my kind regards and remembrances to Dr. Nicholson? I feel I ought to have written to him before leaving Sydney, but I trust he will excuse my not having done so.

I shall be very glad if you can find time to write.

Ever yours faithfully,

T.H. Huxley.

W. Macleay, Esq.

P.S.—Muller has just made a most extraordinary discovery, no less than the generation of Molluscs from Holothuriae!!! You will find a translation of his paper by me in the "Annals" for January 1852.

December 13, 1851.

[To his sister.]

May 20, 1851.