SEE E3RRATA 

 22 



The Vegetation of the 



had only a sum of 40 degrees. So the elm must either be in bloom on the 

 4th of February, when the sum of heat was 280 degrees, or required, in 

 1878, a sum of 460 against 280 in 1886. Amelanchier was in bloom in 

 1878 on the 27th of March, with a sum 454 degrees, and in 1861, on the 

 11th of April, with 453 degrees. December, 1860, had only a sum of 27 

 degrees; accordingly, Amelanchier required 679 degrees in 1878, and only 

 480 in 1861, or the due time of blooming was in 1878, the 8th of March. 



BAEOMETBB. 



The observations on the pressure of the atmosphere comprise twenty- 

 five years from December, 1860, to November, 1885. 



The mean reduced to freezing point was 29.628 inches; the mean, at 

 7 A. M., is 29.644; at 2 p. m., 29.606; at 9 p. m., 29.634. The highest stand 

 was observed in January, 1866, 30,671, and the minimum in April, 1880, 

 28,581, the range being 2.090. 



The greatest range in one month was observed in January, 1866, 

 1.676; the smallest in August, 1878, 0.288. The highest mean of a month 

 had, December, 29.698; the lowest May, 29.548. 



The greatest range in twenty-four hours was observed in January, 

 1.028. In July it is only 0.389. 



There are generally two oscillations in twenty-four hours, with two 

 minima at 11 A. m. and 10 p. m., and two maxima at 4 A. m. and 4 p. M. 

 The rise and falling is, in the tropic countries so regular, that it is pos- 

 sible to determine the daytime from the stand of the barometer; in our zone 

 it -is more variable, so that often a continuous falling or rising for several 

 days is observed. 



Table 4. 



BABOMETER REDUCED TO FREEZING POINT. 



Decembeb 1860 — 1885. 



7 A.M. 



2 p.m. 



Mean. 



Maxi- 

 mum. 



Mini- 

 mum. 



Bange. 



Greatest 

 change in 

 24 hours. 



December 

 January . 

 Eebruary 



March 



April 



May 



June 



July 



August. .. 

 September 

 October . . 

 November 



Year . 



,714 29. 

 724I29. 

 ,688!29. 

 632 29. 



572 

 571 

 58.3 

 607 

 608 

 670 



67729 

 679 29 



29.644 



680 

 685 

 649 

 600 

 540 

 532 

 546 

 572 

 572 

 626 

 629 

 637 



717 29 

 726^29 

 683J29 

 6:^2 29 

 568'27 

 554 29 

 565 29 

 ,58729 

 .590 29 



704 30. 

 712|30, 

 673 30. 

 62130. 

 560 30. 

 552,30. 

 565 29. 



65l|29 

 664 29 

 678 29 



29.606 



29.634 



.589 

 591 

 648 

 657 

 664 



29. 



29 



30 



30 



30 



389 28.771 

 67128.795 

 453 28.823 

 364 28.612 

 252 28.581 

 04l|28.670 

 956 28.996 



29.628 



944 

 965 

 083 

 254 

 308 



30.671 



29.134 

 29.207 

 29.051 

 29.025 

 28.725 



28.581 



1.618 

 1.876 

 1.630 

 1.752 

 1.671 

 1.371 

 0.960 

 0.810 

 0.758 

 1.031 

 1.229 

 1.583 



2.090 



1.017 



1.028 



0.967 



0.950 



0.811 



0.750 



0.508 



0.484 



0.492 



0.617. 



0.718 



0.838 



1.028 



