I hope you will occasionally turn in your mind my argument of the evil done by the "mihi" attached to specific names; I can most clearly see the EXCESSIVE evil it has caused; in mineralogy I have myself found there is no rage to merely name; a person does not take up the subject without he intends to work it out, as he knows that his ONLY claim to merit rests on his work being ably done, and has no relation whatever to NAMING. I give up one point, and grant that reference to first describer's name should be given in all systematic works, but I think something would be gained if a reference was given without the author's name being actually appended as part of the binomial name, and I think, except in systematic works, a reference, such as I propose, would damp vanity much. I think a very wrong spirit runs through all Natural History, as if some merit was due to a man for merely naming and defining a species; I think scarcely any, or none, is due; if he works out MINUTELY and anatomically any one species, or systematically a whole group, credit is due, but I must think the mere defining a species is nothing, and that no INJUSTICE is done him if it be overlooked, though a great inconvenience to Natural History is thus caused. I do not think more credit is due to a man for defining a species, than to a carpenter for making a box. But I am foolish and rabid against species-mongers, or rather against their vanity; it is useful and necessary work which must be done; but they act as if they had actually made the species, and it was their own property. I use Agassiz's nomenclator; at least two-thirds of the dates in the Cirripedia are grossly wrong. I shall do what I can in fossil Cirripedia, and should be very grateful for specimens; but I do not believe that species (and hardly genera) can be defined by single valves; as in every recent species yet examined their forms vary greatly: to describe a species by valves alone, is the same as to describe a crab from SMALL portions of its carapace alone, these portions being highly variable, and not, as in Crustacea, modelled over viscera. I sincerely apologise for the trouble which I have given you, but indeed I will give no more. Yours most sincerely, C. DARWIN. P.S.--In conversation I found Owen and Andrew Smith much inclined to throw over the practice of attaching authors' names; I believe if I agitated I could get a large party to join. W. Thompson agreed some way with me, but was not prepared to go nearly as far as I am. CHARLES DARWIN TO HUGH STRICKLAND. Down, February 10th [1849]. My dear Strickland,