OF ARTS AND SCIENCES. 17 



temperature that it has been thought advisable to present here a table, 

 compiled from the records furnished for the Monthly Bulletin of the 

 New England Meteorological Society, giving the mean of the daily 

 maximum temperature for several stations through the summer. The 

 stations chosen were all at some distance from the sea-coast, so as 

 to be beyond the reach of the diurnal sea-breeze ; they were Brat- 

 tleborough, Vt. ; Concord, N. H. ; Amherst, Princeton, Lowell, and 

 Taunton, Mass. ; and Collinsville, Conn. ; all the records being from 

 self-registering thei'mometers. 



TABLE I. 



Date. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 



June 73 75 71 70 62 71 73 80 63 74 76 79 79 84 78 88 



July 64 74 75 80 82 82 80 87 91 82 78 80 78 69 80 83 



Aug. 85 75 72 84 83 74 74 79 77 78 84 86 85 85 73 75 



Date. 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 



June 75 78 82 85 79 77 69 77 84 83 82 81 80 68 — 



July 92 86 82 87 90 86 84 82 88 87 83 84 82 75 85 



Aug. 78 82 81 72 74 83 76 82 67 63 64 69 70 63 76 



It is to the figures of this table that reference is made in the follow- 

 ing general account of our thunder-storms, under the abbreviation 

 " mean max." 



General Account of Thunder-storms in the Summer Months. 



June 1. Several thunder-storms appeared on this, the first day of 

 systematic observations by our volunteers, and a brief account of them 

 was issued in Bulletin No. 7 of the N. E. Meteorological Society ; 

 they were close to the south of a centre of low pressure that crossed 

 from Lake Champlain to the Gulf of Maine during that day, and the 

 best defined storm moved eastward across southern New Hampshire at 

 a rate of 31 miles an hour. 



June 2, 3. During the approach and passage of an area of high 

 pressure on these days, there were a few reports of light thunder- 

 showers, of thunder heard, or of lightning seen ; but no general storm 

 occurred. 



June 4, 5. In the evening of the 4th, and during the 5th, observa- 

 tions increased in number ; at this time, an area of low pressure was, 

 according to the June Weather Review, advancing from southern Mich- 

 igan to the New Jersey coast. On the 4th, a roughly defined storm 

 of moderate strength, with rather heavy rain, advanced from south- 



VOL. XXII. (n. S. XIV.) 2 



