93 
[ ASSKMB LY 
Geological surveys of other States are now in progress, and ar- 
rangements might doubtless be made to exchange complete suits of 
specimens, so that collections may be obtained which will illustrate 
the various organic and inorganic productions of the United States; 
and if desirable, exchanges might be negociated for extensive col- 
lections of the natural productions of foreign countries. 
I have the honor to be, 
Sir, your obcdH servH, 
W. W. MATHER, 
Geologist of the 1 st geol. district 
of the State of J^Cew- York. 
