To J. de C. Sowerby   19 February [1851]

My dear Sir

The Plate will now do very well;¹ & I am much obliged for all the trouble you have taken, & congratulate you that I can cause no more.

The specimens all arrived quite safe: I thank you for having registered them which I did not think of, & I return you in stamps the Cost.—

With respect to what you say about the payment of the drawings is exceedingly liberal; but on the other hand, the drawings, though no doubt they facilitated the engraving, must have put you to some extra trouble; did you include this trouble in your estimate to the Pal. Soc.? because if not, I must beg you, to make some charge to me, for I should be sorry to take an unfair advantage of your liberality. On the latter view, whenever convenient, please to let me know what I am indebted to you.

Accept my thanks & believe me | Yours very faithfully | C. Darwin

P.S. | M^r. Salter² tells me you have several named fossil Balani; if you could at any time get to these & lend them me, they might & probably would be of great service.³