138 



Mr. J. Glaisher's Remarks on the Weather 



quarter are mostly satisfactory; these I have as usual examined 

 and reduced. 



The daily temperatures of the air till April 28 and after 

 June 6 were for the most part below their average values ; the 

 mean amount of deficiency in the former period was 3^*7, and 

 in the latter it was 2°'7. The daily temperatures between 

 April 29 and June 5 were alternately in excess and defect; the 

 mean temperature of the interval was somewhat above its 

 average value. The days whose mean temperatures departed 

 the most from their averages were April 17, 19, 20, 21 ; May 

 10 and June 12; the defect in these cases were 11°'2; 14°-5; 

 10°-4; 11°-1 ; 10°-2; and 10°-7 respectively. The mean tem- 

 perature of the three months ending May, constituting the 

 three spring months, was ^S^'S^ and that of the average of the 

 seventy preceding springs is 46°'7. The several subjects of 

 research in the past quarter are detailed below. 



The mean temperature of the air for the month of April 

 was 43°"2, hemg less than the average of seventy years by 2°-7, 

 and less than the average of the preceding eight years by 

 5°-0. 



For the month of May was 54°'0, exceeding the average for 

 seventy years by 1°'2, and being less than the average of the 

 preceding eight years by 0°*4. The mean of the quarter was 

 51°- 7, being 0°'5 less than the average of seventy years, and 

 2^'l less than the average of the preceding eight years. 



For the month of June was 57°'9, being of the same value 

 as that of the average from seventy years, and being less than 

 that of the preceding eight years by ]°*9. 



Generally the differences of temperature at one place from 

 the average values for that place sufficiently indicate the de- 

 partures from the means for all other places ; but in the past 

 three months this has not been the case, the northern part 

 of the country having been subjected to a longer continuance 

 of low temperature than usual, and the departures from the 

 mean temperatures in the northern parallels of latitude have 

 been greater than in the southern. This will be more clearly 

 seen in the following table. 



