ABOUT FRUITS, FLOWERS AUD TAEOSISQ. 213 



the albumen and mucilage which are found in vegetable 

 oils. The follo^^^ng analysis of hemp-seed, and flax-seed, or 

 as it is called in England lint or linseed, T\ill show the 

 proportions of various ingredients in one hundred parts. 



Hemp-3e«d. Linseed. 



(Bucholx.) (Leo Meier.) 



Oil 19.1 11.3 



Husk, etc 38.-3 44.4 



Woody fibre and starch, 5.0 1.5 



Sugar, etc 1.6 10.8 



Gum, 9.0 7.1 



Soluble albumen (Casein ?) 24.7 16.1 



Insoluble do — 3.7 



Wax and resin, 1.6 S.l 



Loss, 0.7 3.0 



100 100 



The existence of impurities in oil, such as mucilage, albu- 

 men, gum, etc., which increase its value to the painter, dimin- 

 ishes its value for the lamp, since these substances crust or 

 cloy the wick, and prevent a clear flame. All oils may, 

 therefore, the less excellent they are for painting, be regarded 

 as the more valuable for burning. Rape-seed is extensively 

 raised in Europe, chiefly in Flanders, for its oil, and is 

 much used for burning. Ten quarts may be extracted 

 from a bushel of seed. "We append a table represent- 

 ing the richness of various seeds, etc., in oil. 



Oil per cent. 



Linseed (flax) 11 to 22 



Hemp-seed, 14 to 25 



Rape-seed, 40 to 70 



Poppy-seed, 36 to 33 



White mustard-seed, 36 to 48 



Black mustard-seed, 15 



Swedish turnip-seed, 34 



San-flower seed, 15 



Walnut kernels 40 to 70 



