Evolittloa of Animal Life. 157 



makes rooi'kls make thon.selves ! Such was evidently tlie thought 

 of the apostle who said, " By the loonl of his power were all things 

 made." 



Professor P. IT. Van dek Weyde: — 



I desire to present to the Association an autograph letter of 

 Charles Darwin, never heretofore published, and of interest as 

 bearing upon the subject of this lecture. It was written to my 

 son, who was traveling in South America, and taking photographs 

 of such noteworthy objects and animal remains as he thought 

 worthy of preservation and subsequent study. Some of these pho- 

 tographs, at my suggestion, he sent to Mr. Darwin, receiving this 

 letter in acknowledgment. 



Letter of Charles Dakwix: — 



The letter of Mr. Darwin, which was read to the Association by 

 the President, Dr. Janes, is as follows: 



Down, Beckingiiam, Kent, 



September 29, 1876. 



Dear Sir: I am much obliged for the photographs which you 

 were so kind as to send me. I have sent them to Professor Flower 

 (one of the most capable judges in England) of the Koyal College of 

 Surgeons, where my specimens from the Kio Plata wei'e deposited. 

 He admires the fine specimens of Toxodon, and says that all the 

 others apparently belong to Mylodon. I am extremely glad that 

 you and your friends intend collecting the fossil mammals. I will 

 make two or three suggestions, though perhaps superfluous. 



Judging from a distance, the Barrancas de Gregorio seem to me 

 worth investigating; and it would be advisable to ascertain where 

 these cliffs are contemiioraneous with the Pampean formation. 

 Secondly, as far as I know, the bones of the smaller mammals have 

 not been collected, and these might be as valuable as those of the 

 gigantic mammals: at ;M. Ilermora, near Bahia Blanca, I found 

 the remains of small species. Thirdly, it would be of paramoimt 

 importance to find mammaliiin remains in the tertiary strata, such 

 as those at Sta. Fe Bajada beneath and older than the Pampean 

 formation. Near the mouth of the Uruguay I found such strata 

 with great extinct oysters, and beneath these a formation in 

 character quite like the Pampean, and which therefore it is prob- 

 able would contain mammalian remains. 



Heartily wishing you success, I remain, dear sir, 



Yours faithfully, 



Chari.es Darwin. 



