158 



Abstracts for the Barometer. 



TABLE I. — Monthly Means of the Height of the Barometer, corrected for temperature. 



Month. 



20''. 



23''. 



Ph. 



5''. 



Mean of the 

 Pour 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 



Mean Height of the Barometer for the five months of 1841, 29-460. 



corresponding 1842, 29-634. 



A maximum pressure occurs in both years in August, and a minimum in October 1841 and in November 1842. 



i n. 



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. 



Period. 



20''. 



23i>. 



2i>. 



SI". 



Mean of the 

 Four Hours. 



1841. 



in. 



in. 



in. 



in. 



in. 



July, Aug., Sept. 



29-497 



29-509 



29-507 



29-508 



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 



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., Dec. 



29-583 



29-600 



29-596 



29-596 



29-594 



Jan., Feb., March, ) 

 Oct., Nov., Dec. j 



29-573 



29-586 



29-574 



29-576 



29-577 



April, May, June, 1 

 July, Aug., Sept, J 



29-746 



29-743 



29-718 



29-707 



29-729 



The Year 



29-660 



29-665 



29-646 



29-642 



29-653 



A maximum seems to occur about 23'' in winter, and before 23'' in sunuuer ; a minimum between 2^ and -S** 

 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. 



