N0.275.J 
239 
Temperalure of Springs and Wells. 
Spring at Johnsburgh, issuing from limestone and under cover, 44^ 5^; 
temperature of air 81°. July 22, 1838. 
Of two deep covered wells in Champlain, Clinton county, 44° & 48°; 
temperature of air 76°. 
Of a deep well at the outlet of Schroon lake, 46°. 
At Warrensburgh, 45°; air 74°. July 14. 
A spring at Crown Point landing, 46°; air 56°. May 23. 
Spring at East Moriah, 43°; open air 54°. May 27. 
At Westport, spring, 45°; air 65°. May 31. Another, 43°; and 
another 40°; air 64°. 
Mineral spring at Westport, 44°; air 56°. May 30. Deposits tufa. 
Well at Westport, covered and in the shade, 42°; air 69°. June 1. 
Variation of the Magnetic Medle. 
The observations were made with a theodolite which reads to a mi- 
nute of a degree. The results were obtained by observations on the 
pole star at a given hour in the evening. The time, though not probably 
the exact local time, still approximated very nearly to it, so that very 
little error can arise from assuming it as the true time. 
Variation of the Magnetic JYeedle at Champlain, Clinton County, 29th 
June, 1838, 9° 30'; time, 9 o'clock and 30' P. M. 
At West Chazy, 9° 21'; 8 o'clock, 45'. July 3, 1838. 
At Keeseville, 8° 40'; 10 o'clock, July 6, 1838. 
The variation at Keeseville, in 1825, as obtained by E. F. Johnson, 
Esq. was 7° 30'. 
At Warrensburgh, 7° 15'; 10 o'clock. July 15, 1838. 
The precedmg pages embrace the most important facts which have 
fallen under my observation during the last season. That they may 
contribute to the promotion of agriculture, and in some small degree to 
the advancement of science, is the wish of 
Your most 
Obedient servant, 
E. EMMONS, 
Mhany^ February 1, 1839^ 
