1859—1863] NATURAL HISTORY REVIEW 177 



between the different kinds of varieties, representative species, Letter 118 

 etc. Perhaps I shall find some facts in your paper on inter- 

 mediate varieties in intermediate regions, on which subject 

 I have found remarkably little information. I cannot tell 

 you how glad I am to hear that you have attended to the 

 curious point of equatorial refrigeration. I quite agree that 

 it must have been small ; yet the more I go into that question 

 the more convinced I feel that there was during the Glacial 

 period some migration from north to south. The sketch in 

 the Origin gives a very meagre account of my fuller MS. 

 essay on this subject. 



I shall be particularly obliged for a copy of your paper 

 when published ; l and if any suggestions occur to me (not 

 that you require any) or questions, I will write and ask. 



I have at once to prepare a new edition of the Origin? 

 and I will do myself the pleasure of sending you a copy ; but 

 it will be only very slightly altered. 



Cases of neuter ants, divided into castes, with intermediate 

 gradations (which I imagine are rare) interest me much. 

 See Origin on the driver-ant, p. 241 (please look at the 

 passage). 



To T. H. Huxley. Letter 119 



This refers to the first number of the new series of the Natural 

 History Review, 1861, a periodical which Huxley was largely instrumental 

 in founding, and of which he was an editor (see Letter 107). The first 

 series was published in Dublin, and ran to seven volumes between 1854 and 

 i860. The new series came to an end in 1865. 



Down, Jan. 3rd [1861]. 



I have just finished No. 1 of the Natural History Review, 

 and must congratulate you, as chiefly concerned, on its 

 excellence. The whole seems to me admirable, — so admirable 

 that it is impossible that other numbers should be so good, 

 but it would be foolish to expect it. I am rather a croaker, 

 and I do rather fear that the merit of the articles will be 

 above the run of common readers and subscribers. I have 

 been much interested by your brain article. 3 What a 



1 Probably a paper by Bates entitled " Contributions to an Insect 

 Fauna of the Amazon Valley" {Trans. Entomol. Soc, Vol. V., p. 335, 

 1858-61). 



2 Third Edition, March, 1861. 



3 The "Brain article" of Huxley bore the title "On the Zoological 

 Relations of Man with the Lower Animals," and appeared in No. 1, Jan. 



12 



