60 
amount of oscillation. The total increase for the six winter 
months is 2084 inches against 4-06 inches for the six summer 
months, while the total amounts of disturbance for the 
respective periods are in the ratio of 1 26* 1 3 to 76*44. The 
Author adds, that the ratio of the amounts of increase in the 
winter and summer halves of the year appears to increase 
rapidly with increase of latitude; thus at Lisbon it is as 5 to 
1 ; at Brussels as 6 to 1 ; and at Stockholm as 8^ to ]. 
Mr. Atkinson exhibited a Chart, showing at one view the 
barometric oscillations during the present month of February, 
as observed by him at Thelwall, and also the strength of the 
wind, corresponding to each observed altitude of the barometer. 
Mr. Mosley read an extract from the Gibraltar Chronicle , 
of the 11th February, 1861, giving details of a violent gale 
experienced at that place, and on the coast of Morocco, on 
the 9th of February. The barometer fell to 29 '26 1 , and it 
oscillated violently during the gale, the mercury being jerked 
up and down more than '100 inch. The range of the baro- 
meter between the 26th January and 10th February, was 
1*240 inches, the range for the whole year 1860 having been 
only *865. The range for twenty-four hours, commencing 9th 
February, at 8h. a.m., was *625 inch. The storm appears 
to have been a cyclone moving on a southerly course. It 
was encountered off the coast of Morocco, by the steamer 
Egyptian, veering from S.E. by S.S. VV. to N.W. It was 
met with by the Indus mail steamer between Lisbon and 
Cape St. Vincent, on Saturday, the 9th February, and blew 
a hurricane from N. and N.E. It did not reach the coast of 
Morocco until eight o’clock on the following morning. As 
the occurrence of a cyclone on the Portuguese coast, moving 
in a southerly direction, is unprecedented, this gale will be 
further investigated. 
