60 Mr. Watts on the Analysis of Hop -Ash. 



35-58, differs by only 0-19 from 35-775 the amount of the 

 same directly determined (A. 3). 



The sum of the components which are insoluble in water, 

 viz. 4G-03 + 18-26 = 64-29, differs by 0-06 from the quantity 

 of the same directly determined, viz. 64*23. 



The loss on the whole analysis is 0-13 per cent. 



Quantities of materials removed from an acre of land by the 

 croj). 



The produce, as stated at the commencement of the paper, 

 was 12 cwt. per acre, and the amount of ash is 6| per cent. 

 This gives 8/ lbs. 6 ozs. of ash to the produce of an acre. 

 Hence it is easy to calculate the quantities of the several 

 mineral ingredients of the hops removed from an acre. In 

 this estimate no account need be taken of the bines, since 

 they are rotted and returned as manure to the soil. 



The quantities of the several constituents are as follows : — • 



lbs. oz. 



Phosphoric acid 12 13 



Potash' 17 



Lime 12 6 



Magnesia 4 11 



Sulphuric acid 7 4 



Sihca 15 10 



Alumina, oxide of ii'on and com-"(_ ^ , ^ 



mon salt £ 



~76 Ti 



By way of comparison the following statement of the inor- 

 ganic materials removed by a heavy crop of grain (not in- 

 cluding straw or chaff) of the estimated yield of 42 bushels 

 to an acre *, extracted from the excellent report of Messrs. 

 Way and Ogston in the Agricultural Journal, vol. vii. part 

 2, may prove intei-esting. 



From each acre were removed, — 



lbs. oz. 



Phosphoric acid 21 4 



Potash 13 1 



Magnesia 5 5 



Silica, sulphuric acid, oxide of 1 „ ^. 

 iron, and soda . . . . / ' 



43 1 



It is well-known that the cultivation of hops is carried on 

 by a most lavish application of farm-yard manure to the ruin 



* Specimen No. 41, p. 6.3 1. 



