158 ABSTRACTS FOR THE BAROMETER. 
TABLE I.—Monthly Means of the Height of the Barometer, corrected for temperature. 
Month. 208. 23h, 2h, 5h, Mean of the 
Your Hours. 
1841. in. in. in. in. in. 
July 29-435 29-470 29-482 29-487 29-468 
August 29-576 29-566 29-553 29-569 29-566 
September 29-479 29-492 29-487 29-468 29-481 
October 29-350 29-392 29-363 29-382 29-372 
November 29-433 29.493 29-450 29-440 29-454 
1842. 
January 29-594 29-611 29-568 29-568 29-585 
February 29-592 29-609 29-606 29-641 29-611 
March 29-502 29-500 29-483 29-459 29-486 
April 29.980 29-978 29-923 29.905 | 29-946 
May 29-656 29-643 29-602 29-601 29-625 
June 29-780 29-773 29-765 29.742 29-765 
July 29-680 29-676 29-657 29-651 29-666 
August 29-718 29-721 29-731 29.717 29-722 
September 29-664 29-669 29-635 29-630 29-650 
October 29-692 29-695 29-678 29.665 29-682 
November 29-440 29-451 29-454 29.450 29.449 
December 29-618 29-655 29-655 29-673 29-650 
in. 
Mean Height of the Barometer for the five months of............ 1841, 29-460. . 
Saree hdasaedepuncee cm toarrc Corresponding’. J. 0.2.s.cesecsoseaeeeres LOD, 29°634. 
A maximum pressure occurs in both years in August, and a minimum in October 1841 and in November 1842. 
The greatest mean pressure is that for April 1842; the least that for October 1841 ; the range being 0-574. 
TABLE II.—Mean Height of the Barometer for periods of Three Month, for the Summer and Winter Months 
of 1842, and for the Year 1842. 
Mean of the 
= i _ 3 Four Hours. 
1841. | in. in. in. in. | in. 
July, Aug. Sept. || 29-497 29-509 29-507 29508 | 29-505 
October, November | 29-391 29-442 29-406 29-411 || 29-412 
1842. | | 
Jan., Feb., March | 29.563 29-573 29-552 29-556 H 29-561 
April, May, June 29-805 29-798 29-763 29-749 || 29-779 
July, Aug., Sept. 29-687 29-689 29-674 29-666 | 29-679 
Oct., Nov., Dee. 29-583 29-600 29-596 29-596 29-594 
Jan., Feb., March, re 5 
Oct., Nov., Dee. \ 29.573 29-586 29-574 29-576 | 29-577 
pril, May, June, || ; eas : : , 
Foasage Book } | 29-746 29-743 29-718 20-707 | 29-729 
The Year 29-660 29-665 29-646 29-642 29-653 
I 
A maximum seems to occur about 23" in winter, and before 23" in summer ; a minimum between 28 and 5% 
in winter, and nearer 5" than 2" in summer. : 
The pressure in the three months, July, August, and September 1841, is about as much greater than that in~ 
the two following months, as the pressure in the third quarter of 1842 is greater than that in the last quarter. 
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