181 LETTERS FROM FROF. AGASSIZ. 



very inconvenient for you to think of it, when I beg also 

 you will let it alone until perfectly convenent and agree- 

 able. 



Hoping to hear from you before long, I remain, with 

 high regard, 



Yours, Very Truly, 



L. Agassiz. 

 Dr. KiRTLAND, Cleveland. 



Cambridge, July 8, 1853. 

 My Dear Sir: 



1 have received so many marks of your kind- 

 ness that I must suppose my letters to you were misdi- 

 rected, since I have received no answer, and, indeed, on 

 looking up your last, I find it dated East Rockport instead 

 of Cleveland, to which latter place I have directed mine. 

 I write therefore again. 



During the past Winter I wrote you from Charleston, 

 immediately after the severe sickness under the influence 

 of which I labor to this day; then again, soon after my 

 return, from Cambridge, in the beginning of June, to thank 

 you for the very interesting young specimens of Unio 

 Crassus, with their byssus. 



The object of my first was particularly to beg of you a 

 collection of your fishes. I find such differences between 

 those I have brought home from Cincinnati and the speci- 

 mens collected about St. Louis, that a renewed comparison 

 of all the fishes found between the Missouri and the Atlan- 

 tic States is of the utmost imiDortance, to trace the 

 geographical range of each of them, and to identify those 

 that have a wide distribution, upon a careful comparison. 



