ALLISON — ON THE METEOROLOGY OF HALIFAX. 83 



July was a warm month, 1^.85 above the average ; on the 24th 

 the thermometer reached 91^.5 and the 25th was excessively hot; 

 mean of six observations on that day 75^.27, being the warmest 

 of any day recorded in Halifax in at least twelve years. Mean 

 pressure continued low, and largely composed of force of vapour ; 

 the want of cloud was very marked, and winds light — mean velo- 

 city being only 8.1 per hour — resultant direction south 69^^ west. 

 Kain is not usually abundant here in July, but this had more than 

 any of the summer months of 1870 — 3.21 inches, or an excess 

 over the average of 1.02. I record four fogs, six auroras, thunder 

 once, and lightning twice, two lunar coronas, and two rainbows ; 

 blossoms and fruits were still early. 



As the summer progressed the relative heat was maintained, 

 and August in some respects closely resembled July, the pressure, 

 29.659, being almost identical, and amount of cloud one tenth 

 less ; the atmosphere was sensibly more dry however ; the wind had 

 veered farther northward, resultant direction north 77^ west, and 

 mean velocity increased to 10.5 miles per hour; but 2.20 inches of 

 rain fell, scarcely two thirds of calculated average ; number of fogs 

 was three, auroras five, thunders three, and lightnings three, one 

 lunar halo and one lunar corona. The advance of the season, in 

 animal and vegetable life, proceeded at about same rate as before 

 remarked. 



The temperature of the year made a greater decline than usual 

 in September, which month had a mean temperature of 57*^.20, or 

 7*^.68 below August. The atmosphere never descended to the freez- 

 ing point, but on 30th 32^ were registered by grass minimum ther- 

 mometer. The average date of first appearance of this phenome- 

 non is 19th September. Mean pressure did not yet reach its nor- 

 mal. Hygrometric results were about as usual, with still a great 

 deficiency of cloud, and wind not strong generally, resultant direc 

 tion was north 15"^ west, and mean velocity 10.6 miles per hour; 

 rain was .50 short ; three fogs were observed, three auroras, one 

 hoar frost, as noted above, one thunder and lightning, two lunar 

 halos, and one solar corona, one rainbow, three gales. In the gale 

 of 4th wind reached 70 miles per hour, from six to seven a. m. 

 The progression of temperature brought the usual signs of declin- 

 ing summer, at a date quite as early as customary. 



