46 EVOLUTION [CHAP. II 



have acquired, or the other to have lost through any known operation of 

 physical causes ; for we are hence led to conclude that the tribes thus 

 distinguished have not descended from the same original stock." l 



As was his custom, Mr. Darwin pinned at the end of the first volume 

 of the 1841-51 edition apiece of paper containing a list of the pages 

 where marked passages occur. This paper bears, written in pencil, 

 " How like my book all this will be ! " The words appear to refer to 

 Prichard's discussion on the dispersal of animals and plants ; they 

 certainly do not refer to the evolutionary views to be found in the book. 



Letter 15 To J. D. Hooker. 



Down [1844]. 



Thank you exceedingly for your long letter, and I am in 

 truth ashamed of the time and trouble you have taken for me; 

 but I must some day write again to you on the subject of 

 your letter. I will only now observe that you have extended 

 my remark on the range of species of shells into the range 

 of genera or groups. Analogy from shells would only go so 

 far, that if two or three species .... were found to range 

 from America to India, they would be found to extend 

 through an unusual thickness of strata say from the Upper 

 Cretaceous to its lowest bed, or the Neocomian. Or you may 

 reverse it and say those species which range throughout the 

 whole Cretaceous, will have wide ranges : viz., from America 

 through Europe to India (this is one actual case with shells 

 in the Cretaceous period). 



Letter 16 To J. D. Hooker. 



Down [1845], 



I ought to have written sooner to say that I am very 

 willing to subscribe i is. to the African man (though it be 

 murder on a small scale), and will send you a Post-office- 

 order payable to Kew, if you will be so good as to take charge 

 of it. Thanks for your information about the Antarctic 

 Zoology ; I got my numbers when in Town on Thursday : 

 would it be asking your publisher to take too much trouble 

 to send your Botany [F/ora Antarctica, by J. D. Hooker, 1844] 

 to the Athenaeum Club ? he might send two or three numbers 



1 Prichard, ed. 1836-7, Vol. I., p. 106. This passage is almost 

 identical with that quoted from the second edition, Vol. I., p. 90. The 

 latter part, from " and two races . . . ," occurs in the second edition, 

 though not quoted above. 



