148 ABSTRACTS FOR THE VERTICAL ForcE. 
TABLE XVIII.—continued. 
Mean of the || Range of the Four Hours 
Four Hours 
of each For each For each 
Month. Month. Two Months. 
1842. ) | wakieior P| Mauser | : Mic. Div. Mic. Div. ae oe 
January 993-3 11-1 
February : 977-9 + 
March 934-2 
April 924.3 bis 
916-4 ey 
29-4 
893-9 
32-9 
866-9 
August 855-5 
September 853-1 
October 828-2 
November 816-0 
December 789-8 
The rejection of disturbances produces a considerable difference in the results deduced from Tables XVI. and 
XVII. 
In 1841, the highest means occur at 5"; the lowest mean in July is at 23", in August at 2%, and in Sep- 
tember, October, and November, at 20%. 
A maximum occurs in August, September, and October, about 23) 
A minimum occurs in July, between 20" and 234, in August, September, and October, about 2}. 
In 1842, the highest means, with two exceptions, are at 5"; in February, the highest is at 23", and in August, 
at 20"; but they differ little from the mean at 5". 
The lowest means in the first three and last four months of the year aro at 205. In the remaining months 
at 2". In March, the means at 205 and 2” are equal. 
A maximum occurs in January, February, and March, about 234, in October about 22". 
A minimum occurs in January about 2", in February between 2" and 5*, in March, April, May, June, July, 
August, and October, between 23" and 2". 
The mean of the four hours for each month shews a decrease of vertical force from the beginning to the end 
of the year ; the diminution from month to month is rather irregular. 
The ranges for each month are irregular ; but when the mean of each two months is taken, the increase of 
sange from summer to winter is very regular, and well marked, 
The following Table is formed from Table XVIII, 
