USEFUL TABLES AND MEMORANDA. 



THE following Tables of Useful Information have been carefully compiled from 

 reliable autborities, and, we believe, may be depended on as being accurate. 

 Questions relative to operations connected with the soil are continually cropping up. 

 To cope with these requires a certain amount of technical knowledge, and it is to 

 provide such that we introduce these memoranda in this work. 



TEMPERATURE, 11AI3^, Etc. 



Temperature. The average temperature in the 

 temperate zones being authoritatively given 

 as fifty degrees Fahrenheit, it may be interest- 

 ing and instructive to many to Itnow the 

 average temperature at different points in the 

 TJuited States, and at cities in various parts 

 of the world. 



An Inch of Rain. An English acre consists of 

 6,272,640 square inches, and an inch deep of 

 rain on an acre yields 6,272,640 cubic inches 

 of water, which, at 277,274 cubic inches to tne 

 gallon, makes 22,622.5 gallons ; and as a gal- 

 lon of distilled water weighs 10 lbs., the rain- 

 fall on an acre is 226,223 lbs. avoirdupois. At 

 2,000 lbs. to the ton, an inch deep of rain 

 weighs 113,127 tons per acre, or for every 

 100th of an inch considerably over a ton of 

 water falls per acre. — Builder. 



Weight of Water. Water. — A cubic inch of 

 water weighs .0361 lb. ; a gallon 10 lbs. ; a 

 cubic foot, 62.32 lbs., or measures 6.23 gallons, 

 or a cubic foot of water may be set down at 

 as equal to 6<^ gallons. 



^Thermonietric Scales, French and English. 



