CORRESPONDENCE WITH DR. MANTELL. 203 



that occasion. I attended the last soiree, and exhibited my 

 new microscope. Prince Albert was present, and I showed 

 his Royal Highness that beautiful animalcule, the stephan- 

 oceros, and some vorticellae, and other rotifers, fed with car- 

 mine. He was much gratified with their examination, and 

 appeared to be fully conversant with their nature. 



TO DR. MANTELL. 



YALE COLLEGE, September 15, 1842. 



I THANK you for your remarks upon the Iguan- 



odon, and I should like to know, when you write again, 

 what dimensions you now give to the tail, how much, for 

 example, you have shortened an iguanodon of seventy- five 

 feet in length, as formerly estimated by comparison with 

 the leviathan! I am much amused by the comparison' 

 with the leviathan. Owen's splendid work came in the 

 same parcel with your elegant little book on a pebble. 

 The copies directed were gratefully received, and all the 



ladies (including Mrs. H , who is with us) beg to 



present their best thanks, in which I candidly unite. I 

 have read this miniature Geology again, and find you have 

 enriched and enlarged it, and am glad to find that it is in 

 its sixth edition ; may it reach its twentieth. I have had 

 time only to look cursorily over Mr. Owen's article on the 

 Iguanodon. He appears to intend to do you justice ; but 

 perhaps there may be something said or omitted in some 

 other part of the work which I have not seen, and which 

 would alter my impressions. At any rate, you are wise in 

 avoiding strife, and in cultivating those calm and heavenly 

 feelings so beautifully illustrated by Mrs. Hemans in the 

 verses which you quote. I am sorry to hear that you still 

 suffer ; but it is apparent from your chirography that your 

 nerves are composed (the pen does not flow easily and 

 correctly when the nerves are agitated), and your mind is 

 evidently in vigorous action, however your feelings may be 

 saddened The passage in your letter relating to 



