300 I Assembly 



[n my examinations oi the meteorological records, kept at West 

 Jranville, on the bank of Pawlet river, which discharges its waters 

 towards the Gulf of the St. Lawrence, I found the temperature on the 

 first of January, 1848, and the first and second of June of that year, 

 and also that of July 13 and 16 of 1849, to correspond with that of 

 Franconia. 



In April, 1849, a destructive frost was experienced throughout a 

 great extent of surface in the Northern Hemisphere ; on the )5th and 

 16th, the cold was severe, and snow fell in many places. In my 

 examination of the meteorological records at Granville, I found that 

 the cold term filled the first section of a circle of 360 hours, having a 

 duration of 45 hours, or one-eighth of the circle, during which the 

 temperature of the air was at and below the freezing point. This is 

 the most southern latitude in which I have been enabled to discover 

 the existence of a cold cycle in the month of April. 



The great fire in the city of New- York, on Dec. 16, 1835, occur- 

 red during a period of intense cold, and in my examination of the 

 meteorological records kept at Granville, I found that a cold cycle 

 existed there of 180 hours, bemg four sections, or eights, of the circle 

 of 360 hours. In my examination of the meteorological records kept 

 at Gouveneur, St. Lawrence county, N. Y., I found on the morning 

 of the 17th of Dec, 1835, that the temperature was 40° below zero, 

 and the mercury congealed. 



In the month of February, 1848, in computing the number of hours 

 of the month of January of that year, during which the temperature 

 was at and below the freezing point, I discovered a term of 90 con- 

 secutive hours during which the atmospheric temperature was at and 

 below the freezing point ; and on a further examination, I found a 

 like term of 90 hours in the month of December, 1847, and two 

 terms of the same length in February, 1848. With this beginning, I 

 set out on a new path of travel in the meteorological field, in which 

 I have been eminently successful. 



In March, 1848, there were three cold cycles — two of these were 

 of 90 hours duration, and the other of 45 hours, or half of 90. 



