$* AGRICULTURAL TEXT-BOOK. 



Sulphuric acid, - 



o i 



Silica, . . . 



Peroxide of iron, . . . . - 1 43 



Chloride of sodium, - .. fc . Q ^ 



In some specimens the chloride of sodium amounted to 1.01, and 

 chloride of potassium to 5.C5 per cent. 



235. Organic analysis of Barley dried at 212 R 

 tr and Horsford, and Thompson.) 



236. Barley has been less perfectly examined than any of 

 the other cereals, except oats, and the nature of the gluten con 

 tained in them is totally unknown, All that can be said with 

 certainty upon this point is confined to the observation that the 

 gluten of these two grains is mechanically separated with much 

 greater difficulty than that of either wheat or rye; that by the 

 agency of some other substance in the flour, it is almost whol 

 ly dissolved in water, and is much less abundant than in either 

 of the other two. It is also probable that it contains but little 

 fibrin, and resembles in this respect the gluten of rya 



237. Hermbstadt, in experimenting with Barley, found that 

 Che action of nitrogenous manures tends rather to increase thd 

 crop than to the production of gluten. 



238. According to Proust, the greater part of the non-nitro 

 genous constituent in Barley is not starch, although a substance 

 similar to it, but insoluble in boiling water, which he called hor* 



