368 Register of the Thermometer, kept at Boston. 
Falls, N. Y., called the Trenton limestone. The most common frag- 
ment found is the corner of the shield with its thorn-like ke ts 
(see the figure, Plate III.) For the information of geologists, | would 
observe, that figure 2 was found just below the stratum most abundant in 
the genera D yris, Turritella, and Trochus, and that Mr. Carley’s 
specimen occurred in the en of the Isotelus gigas, ay the 5 ighiaa : 
lithus tesselatus. 
Arr. xv 11L—Register fiche Sar from 1830 to 1839, 
kept carga wee? th J. Pp Bait: 
“e 
96 93'29 57196 14/46 
be chs al bo 
From the table it will be seen, that the mean lerhporatute of 
every month except January, was lower in the ten years from 
1830 to 1839, than in the ten years from 1820 to 1829. 
Two years (1836 and 1837) were of remarkable coldness. In 
these years, the eetipiote grain and corn were cut off to such an 
extent, that large importations were necessary to supply the de- 
man 
“The thermometer rose to” 99° on the Qist and 22d of July, 
1830, and the 26th of July, 1834, and fell to 10° below zero on 
= Ath of. January, 1835, and 24th of January, 1839, 
— roa 7, a.M., 2 and 9, p. ». 
1841. 
Meanof th’ 
1l0y’rs f'm 
1820 to ‘29, 
