CONTENTS. 485 



PAGE 



G-RAIN, WEIGHT or, as established by the Legislatures of the differ- 

 ent States 189 



(TRAIN, PER CENT. OF OIL IN 191 



G-RAIN, QUANTITY OP, TO sow PER ACRE, &c 192 



GRAVITY, SPECIFIC, Illustrated 182 



To find the specific gravity of a body 183 



" " " " " " " lighter than water 183 



To reduce the gravity of a body to its weight in Ibs. per cubic foot 184 



Table, showing the specific gravity of various bodies 185 



To find the weight of a cubic foot of substance, the specific grav- 

 ity being given . . : 185 



To find the number of cubic feet in any irregular body 186 



Table, showing the weight of a cubic foot of different substances 187 



HAY, MEASUREMENT OF, Illustrated 51 



To find the number of tons of hay raked into windrows 52 



" " " " " " in a mow 52 



" " " " " in old stacks 53 



" " " " " " in long, square stacks 53 



" " " " " " when taken out of old mows 



or stacks 54 



Table, showing the price per cwt. of hay at given prices per ton 54 

 An easy mode of ascertaining the value of a given number of Ibs. 



of hay at a given price per ton of 2000 Ibs 55 



HEAT, EFFECTS OF, ON DIFFERENT BODIES 121 



HEATING INCLOSED AIR . . 122 



