frankfort^ Jan. 23j 1839. 
To tiis fixceilency W. H* SewArd, 
Governor of JSTew- York. 
SIR:— 
I have the honor to enclose herewith my report on the First 
Geological District of New-York. It contains my report on the econo- 
mical geology of New- York, Westchester, Putnam, Rockland and 
Orange counties, marked ( A, ) and an appendix in two parts marked 
( B ) and ( C. ) 
The document marked ( B, ) is on the descriptive geology of Orange 
county, by Dr. Horton; the other, marked ( C, ) is on that of New- 
York county, by Dr. Gale. 
I have the honor to be, 
Sir, your ob't serv't, 
W. W. MATHER, 
Geologist First District, JYew-York^ 
