OF ARTS AND SCIENCES. 35 



Lawrence, and it was not till after a high temperature had been reached 

 with southerly winds (mean max. 86°) that the cooler northwesterly 

 winds appeared. It is rather curious to note that this change was not 

 accompanied by distinct storms, for only six reports came in for this 

 day, and of these only one (from Mayfield, Me.) describes a storm of 

 any violence. 



Aug. 15-17. There were no reports received for this cool period of 

 high pressures and fine weather. 



Aug. 18. During the approach of the succeeding area of low 

 pressure and consequent rise of temperature under southwesterly winds, 

 there came another period of storms. Several showers were felt on 

 the 18th. A small one occurred in southern Rhode Island and Mas- 

 sachusetts about sunrise. A much larger one arrived in northwestern 

 Massachusetts about 16'\ and moved southeastward, at a rate of 20 to 

 30 miles an hour, into Rhode Island at 20'' ; its rain was rather heavy, 

 and the lightning severe at several places, and there was generally a 

 change from moderate southerly to gusty westerly winds as the storm 

 approached. A third and less defined storm passed over nearly the 

 same district in the evening. At this time, the low pressure area was 

 central in Canada north of Montreal. 



Aug. 19. Under the influence of the same low pressure area, which 

 moved slowly northeastward, a high temperature was maintained into 

 the 19th, and the day began with a storm that came from New York a 

 little after midnight. It was felt as a heavy rain at Albany about one 

 A. M. ; a few reports at early morning hours in Massachusetts and 

 Connecticut probably refer to the same storm, and at 5-6^ it passed 

 over Rhode Island. This would make its velocity and direction about 

 the same as those of the storm the afternoon before, but this conclusion 

 is not very securely based. In the afternoon, several showers occurred 

 in Vermont, New Hampshire, and Maine, but they cannot be safely 

 traced, owing to the want of sufficient observers. At about the same 

 time, a storm of some strength passed over Connecticut and Rhode 

 Island, moving east-southeast about 30 miles an hour. It entered 

 northwestern Connecticut about 15''.30, with dark clouds, a brisk to 

 high squall from the northwest, followed by heavy rain and some hail. 

 At Norfolk, the temperature fell from 75° to 57° in an hour, and 0.87 

 of an inch of rain was collected in eighty minutes. But this degree of 

 strength was not long continued, and in Rhode Island the storm faded 

 away between 18'' and 19*^. 



Aug, 20, 21. During the passage of an area of high pressure, the 

 maximum temperature fell ten degrees below that of the preceding 



