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 appendage, 

 (see the figure, Plate III.) For the information of geologists, I would 

 observe, that figure 2 was found just below the stratum most abundant in 

 the genera Delthyris, Turritella, and Trochus, and that Mr. Carley's 

 specimen occurred in the region of the Isotelus gigas, and the Crypto- 

 lithus tesselatus. 



Art. XYIII. — Register of the Thermometer from 1830 to 1839, 

 ke-pt at Boston, Mass. / by J. P. Hald, 



Years. 



1830 



1831 



1832 



1833 



1834 



1835 



1836 



1837 



1838 



1839 

 Mean of 10 i 

 years, 5 

 Meanofth' ] 

 lOy'rs f m 

 1820 to •29, \ 



Jan. 



25.73 

 23.38 

 27.38 

 31.16 

 24.85 

 27.26 

 26.94 

 21.74 

 33.28 

 27.12 



26.88 



26.23 



Feb. 



25.94 

 24.86 

 28.73 

 25.45 

 34.23 

 25.46 

 20.95 

 25 70 

 19.27 

 29.18 



25.98 



29 57 



Mar. Aprl 



37.55 

 41.34 

 36.98 

 33.03 

 37.53 

 32.80 

 31.84 

 31.86 



48.07 

 48.51 

 41.99 

 48.74 

 46.88 

 43.84 

 4S.73 

 44.72 



35.7941.66 

 35.71 47.48 



35.4445.56 



36.14 



46.13 



May. [June 

 5X08 66.67 

 59.31,71.47 

 53.15 64.48 

 5S.91'63.23 



53.44 63.84 

 55.26'65.42 

 55.44'58.91 

 52.97,63.75 

 54.8468.86 



56.45 62.54 



55.68 64.91 



57.57 



67.00 



July. 

 72^04 

 73.09 

 68.04 



Aug, 

 69.95 

 72.39 

 69.85 



72.0667.04 

 74.0368.28 

 71.75 68.75 

 69.1965.12 

 68.4565.32 

 74.2269.14 

 72.49 68.93 



71.54 



72.41 



68.48 



Sept. 



Oct, 



59.27,52.70 

 63.0853.76 

 61.24:52.15 

 62.28 50.56 



62.86 

 57.90 

 60.46 

 59.00 

 61.03 

 62.20 



60.93 



69.8962.60 



49.03 

 53.54 

 45.22 

 48.03 

 47.70 

 51.39 



50.40 



51.35 



Nov. 



Dec. 



46.68 35.22 

 40.82 19.14 

 41.78,31.35 

 38.3031.84 

 38.5228.55 

 40.22,23.43 

 36.77,29.52 

 39.26 28.93 

 35.65 26.72 

 37.6231.90 



39.5628.66 



39.87,32.38 



Mean of 

 year. 



49.74 

 49.26 

 48.09 

 48.55 

 48.50 

 47.14 

 45,34 

 45.81 

 47.35 

 48.58 



47.83 



49.26 



From the table it will be seen, that the mean temperature 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 crops of grain and corn were cut off to such an 

 extent, that large importations were necessary to supply the de- 

 mand. 



The thermometer rose to 99'^ on the 2 1st and 22d of July, 

 1830, and the 26th of July, 1834, and fell to 10° below zero on 

 the 4th of January, 1835, and 24th of January, 1839. 



Hours of observation, 7, a. m., 2 and 9, p. m. 



Boston, Mass., 1841. 



