TRANSACTIONS OF THE SECTIONS. 



41 



From the above it will be seen that in July the greatest number of calm days 

 occurred between midnight and 4 a.m., and the least number at S"" 30" p.m. ; and 

 in August the greatest number from 11 p.m. to 6^ 30"" a.m., and the least number 

 from 2 P.M. to S* 30" p.m. ; also that in each month there was a gradual increase 

 from the minimum to the maximum number. 



The mean pressure in July was least from 12'' SO" a.m. to 5 a.m., and greatest 

 at 2'' 30" P.M., and in August least from 12 a.m. to 2 a.m., and greatest at l"" 30" p.m. 



The greatest pressure was heaviest in July at 10 a.m. and in August at 8^ 30"" a.m. 

 The greatest pressure was least in July between 8''30™ p.m. and 4*" 30"" a.m., and in 

 August at 12'' 30"° a.m. 



In July the range of calm days was from 3 to 26, i. e. 23, and in August 3 to IQ, 

 i. e. 16. The range in mean pressure was in July from about Og- oz. to 4 oz., or 12 

 times as strong; and in August from 1 oz. to 12 oz., or 12 times as strong. The 

 greatest force in July ranged between 3 oz. and 2 lbs. 3 oz., an increase of 12 times ; 

 and in August between 5 oz. and 3 lbs. 3 oz., an increase of 10 times the force. 



Singular Iridescent PhcBnomenon seen on Windermere Lake, Oct. 24, 1851. 



By J. C. MouNSEY. Communicated hy J. F. Miller, Ph.D., F.R.S. Sfc. 



The morning was very misty, and the barometer high (30-35 at Whitehaven). 

 Between 10 and 11 a.m. the mist cleared oif, the sky became cloudless and the air 

 calm, the lake being of a glassy smoothness. At 11, we went on the lake, and in 



