60 



amount of oscillation. The total increase for the six winter 

 months is 20*84 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 126* 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 J to 1. 



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 1 1th 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*261, 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.W. 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. 



