Chap. V. O B S E R V A T I O N S, iifr. \ji 



C H A P. V. 



Observations on the Weather, made during the years 1755 

 and 1756, at DenainvillierSy near Petiviers, in the Province of 

 Gatinois, i(J_yM. Duhamel. 



S E C T. I. 



Ohfervations made during the year iJSS' 



M. 



Duhamel has given in each of his volumes, an abllract of the 

 '• ftate of the weather, and of the efFeft it had upon the health 

 of animals and the growth of vegetables. The whole feries of his 

 obfervations on this fubjeia is the lefs neceffary, as the flate of the 

 weather is generally mentioned in the account of the experiments. 

 We fliall therefore give only his obfervations daring the two laft 

 years, as a model for others to follow. 



January. 



The weather was very cold all this month : M. de Reaumur's 

 thermometer was almoft continually below the freezing point : on 

 the 6th at noon, it fell to ten degrees below freezing; and on the 

 8th, in the evening,, to 11 degrees,* 



The o-reateft variations of the barometer were from 27 to 2S 

 inches, and one twelfth. -f- 



But little rain fell this month. The continual frofts prevented cul- 

 tivating the earth. 



February. 



The-cold continued all this month. On the 4th, in the morning, 

 the thermometer fell to eight degrees and an half below the freezing 

 point: confequently no ground could be plowed or hoed. 



The barometer was always very low : on the 7th, it fell to 26 

 inches and an half: fome rain fell that day, and die wind was yeiy 

 violent. 



Mar-ch 



* Thofe who would compare M. tie Reaunun-'s fcale with that of Farenheit, 

 which is more generally ufed in this country, may confuh Dr. Martin's Eflay on tlje 

 Cooftru£tion and Gradation of Thermometers. 



t The Eiiglifliinckis to the French inch, .is looo ai^ to 1068. 



