220 WEIGHTS AND MEASURES. 



The following are convenient in the conversion of the 

 weights and measures of one system into another: 



1 meter =39.37 inches. 



1 foot =0.304 meter. 



1 liter = 61.03 cubic inches = 1.06 U. S. qts. 



1 liter =33.81 U. S. fluidounces. 



1 gramme = 15.43 grains. 



1 grain = 0.0648 gramme. 



1 ounce (apoth.) =31.1 grammes. 



1 ounce (avoirdupois) =28.35 grammes. 



1 pound (apoth.) =373.2 grammes. 



1 pound (avoirdupois) = 453.6 grammes. 



EEAGENTS. 



FEHLING'S SOLUTION. Make up and preserve in two 

 parts: A and B. 



(A) Dissolve 34.64 grammes of crystallized, non- 

 effloresced copper sulphate (CuS0 4 , 5H 2 0) in water and 

 make up the volume to 500 cubic centimeters. 



(B) Dissolve 173 grammes of pure, crystallized Eo- 

 chelle salt (sodium and potassium tartrate) and 50 grammes 

 of sodium hydrate in water, and bring the volume to 500 

 cubic centimeters. 



Before using mix equal volumes of A and B. 



NYLANDER'S EE AGENT. Dissolve in 100 cubic centi- 

 meters of water 2 grammes of subnitrate of bismuth, 

 4 grammes of Eochelle salt, and 10 grammes of NaOH. 



ESBACH'S REAGENT contains, in a liter, 10 grammes 

 of picric acid and 20 grammes of citric acid. 



