APPENDIX XI. 323 



of Comparative Zoology, Cambridge, Mass., and should be 

 labelled with the name in full of the exact locality from 

 which they are taken. 



Yours very truly, 



LIVINGSTON STONE, 



Secy A. F. C. A. 



The following letter is added, at Professor Agassiz's 

 suggestion : — 



Cambridge, Januaiy 20, 1871. 



Dear Sir : I am greatly obliged to yOu for your kind 

 offices in helping me to secure the necessary materials for 

 a proper investigation of our salmon, etc. 



A single specimen of any fish of this family, even the 

 common brook trout, from any locality, with label attached, 

 mentioning the name of the place, would be very accept- 

 able, as indicating the range of distribution. Of the rarer 

 varieties, several specimens are desirable. Besides the 

 specimens that may be thus brought forward, I would like 

 an opportunity to critically study the specific characters 

 of all the diflferent species of the family found upon this 

 continent. To this eflfect I should have a large niunber 

 of specimens of each species, in every stage of growth, 

 collected in the same locality, so that there could be no 

 doubt of its being the same kind offish, and yet a chance 

 be afforded of studying all the variations of age, sex, sea- 

 son, etc. For the salmon, for instance, it would be neces- 

 sary to have very young ones, others two, three, four, five 

 inches, etc., to full-grown ones,/>(?w one place^ where the 

 true salmon alone is found ; then the same for the land- 

 locked salmon ; then the same again for the Sebago sal- 

 mon. This would settle the question whether we have 

 one, two, or three species of salmon. Next, I would 

 wish for the same opportunity of studying, in every stage 

 of growth, the lake trout, the brook trout, the grayling, 



