464 



DISCUSSIOX OF BAROMETRIC OBSERVATIONS. 



brevity, as it is in every case 29 inches. The computation was ex- 

 tended to four places of decimals, though it has been thought unneces- 

 sary to give more than three. 



Table I. 



Atmospheric pressure for every day in thsjyear^'rom the periodic function. 



Day of the month. 



9. 

 10 

 11. 

 12. 

 13. 

 14. 

 15. 

 16. 

 17. 

 18. 

 19. 

 20. 

 21. 

 22. 

 23. 

 24 

 25. 

 26. 

 27. 

 28. 

 29. 

 30. 

 31. 



785 

 786 

 786 

 787 I 

 787 I 



787 ! 

 788 



788 ; 

 788 

 787 

 787 

 787 

 786 

 785 

 784 ' 

 784 

 783 

 781 

 780 

 779 

 777 

 776 

 774 

 772 

 770 

 768 

 766 

 764 

 762 

 760 

 758 



Means '.7791 



Means from record 1. 7740 



Means from corrected 

 record 



+57 

 ,7727 



756 

 753 



751 

 749 

 746 

 744 

 742 

 739 I 

 737 I 

 735 I 

 732 

 730 

 728 >. 

 726 I 

 724 I 

 721 j 



719 : 



■il7 

 715 

 713 

 711 

 710 

 708 

 706 

 705 

 703 

 701 

 700 

 699 



.7255 

 .7365 



-110 

 .7351 



697 

 096 

 695 

 693 

 692 

 691 

 690 



688 

 687 

 686 

 686 

 085 

 684 

 684 

 683 

 682 

 682 

 681 

 68] 

 680 

 680 

 680 

 679 

 679 

 678 



.6854 

 .6732 



+ 122 

 .6732 



677 

 676 

 676 

 675 

 675 

 674 

 674 

 673 

 673 

 672 

 672 

 671 

 671 

 670 

 670 

 669 

 669 

 668 

 668 

 667 

 667 

 666 

 666 

 666 

 665 

 665 

 664 

 664 

 664 

 663 



6696 

 6780 



-84 

 6818 



663 

 663 

 662 

 662 

 662 

 662 

 661 

 661 

 661 

 661 

 661 

 661 

 661 

 662 

 662 

 662 

 662 

 663 

 663 

 663 

 664 

 664 

 665 

 665 

 666 

 667 

 667 

 668 

 669 

 669 

 670 



671 



671 

 672 

 673 

 674 

 675 

 676 

 676 

 677 

 678 

 679 

 680 

 681 

 682 

 682 

 683 

 684 

 685 

 685 

 686 

 687 

 687 



690 

 690 

 691 

 691 

 692 

 692 



.6636 

 .6588 



693 

 693 



694 

 694 

 695 

 695 

 695 

 096 

 696 

 697 

 697 

 697 

 698 

 698 

 699 

 699 

 700 

 700 

 701 

 701 

 702 

 702 

 703 

 704 

 704 

 705 

 706 

 707 

 708 

 709 

 710 



711 

 712 

 713 

 714 

 716 

 717 

 719 

 720 

 722 

 723 

 725 

 727 

 728 

 730 

 732 

 734 

 736 

 738 

 740 

 742 

 744 

 746 

 748 

 750 

 752 

 754 

 756 

 759 

 761 

 763 

 765 



767 

 769 

 771 

 772 

 774 

 776 

 777 

 779 

 780 

 782 

 783 

 784 

 785 

 786 

 787 

 788 

 789 

 789 

 790 

 790 

 790 

 790 

 790 

 790 

 789 

 789 



787 

 786 



785 



783 



782 



781 



779 



777 



776 



774 



772 



770 



768 



766 



763 



761 



759 



756 



754 



752 i 



749 



747 



744 ' 



742 



740 



737 



735 



733 



730 



728 



726 



724 



722 



720 

 719 



717 

 715 

 714 

 712 

 712 

 710 

 709 

 709 

 708 

 707 

 707 

 707 

 707 

 707 

 707 

 707 

 708 

 708 

 709 

 710 

 711 

 712 

 713 

 715 

 716 

 218 

 720 

 721 



6999 



7057 



7354 

 7250 



,7835 

 ,7968 



,7553 .7118 

 ,7506 .7068 



+48 

 .6594 



+16 

 ,6822 



-58 +104 

 . 6978 . 7280 



—133 

 .7954 



+47 +50 

 7516 .7094 



725 

 725 

 727 

 729 

 Tii 

 7?4 

 V36 

 738 

 741 

 743 

 745 

 748 

 750 

 752 

 755 

 757 

 759 

 761 

 764 

 766 

 768 

 770 

 772 

 774 

 775 

 777 

 778 

 780 

 781 

 783 

 784 



.7557 

 .7624 



-67 

 7624 



It here appears that the extremes of the annual fluctuation are the 

 maximum 29.7903 on the day of the autumnal equinox, with the mini- 

 mum 29.6612 on May 10, while a subordinate wave occurs in the begin- 

 ning of the decline from the September maximum, reaching a minimum 

 value of 29.7066 in the middle of ]Srovember, with a subsequent rise to 

 29.7877 on the 8th of January. 



The most marked deviation between the monthly means of the com- 

 puted normal values and the means which were the basis of computa- 

 tion, aside from those which are due to maxima or minima already ex- 

 posed, is found in the months of March and April ; and this is due to a 

 deviation from the regular jjrogress occurring in the end of March, 

 which will be noticed hereafter in its proper place. 



It is well known that the accidental barometric oscillations have a 

 greater range in the winter than in the summer months, and for the 

 purj)ose of obtaining a quantitative determination of the normal degrecr 



