748 APPENDIX. 



Commercial weights and measures of the U. A. 



1 pound avoirdupois = 16 ounces. 



1 ounce = 437.5 grains. 



1 gallon = 231 cubic inches. 



1 gallon = 4 quarts = 8 pints. 



1 pint of water weighs 7291.2 grains at a temperature of 15.6. 



Apothecarie^ weights. 



The apothecaries' ounce is of the same value as the now obsolete English Troy 

 ounce. 



1 ounce 8 drachms 480 grains. 



1 drachm 3 scruples 60 grains. 



1 scruple 20 grains. 



1 ounce 31.103 grammes. 



1 grain 64.799 milligrams. 



Apothecaries' fluid measures. 



These are derived from the U. S. gallon ; the liquid pint of this gallon is identical 

 in value with the apothecaries' pint. 



1 pint 16 fluidounces 7680 minims. 



1 fluidounce = 8 fluidrachms 480 minims. 



1 fluidrachm 60 minims. 



Jewelers' weight. 

 1 carat = 0.205 gramme 3.163 grains. 



