On Subsoil- Ploughing. 



37 



s. d. 



4th. Of carbonate of lime and carbonate of magnesia 10 0 



5th. Of alumina 10 0 



6th. Of gypsum (sulphate of lime) 10 0 



7th. Of gypsum and phosphate of lime .... 12 6 



8th. Of alumina and oxide of iron 12 6 



9th. Of silica, alumina, oxide of iron, and vegetable 



matter 150 



A statement of the quantity of water of absorp- 

 tion and of soluble matter, as also of the specific 

 gravity, will be supplied in addition to any of the 

 above, at a further charge of 2s. 6c?. each. 

 10th. Of silica, alumina, oxide of iron, carbonate of 

 lime, carbonate of magnesia, vegetable, ani- 

 mal, and soluble matter, and of water of 

 absorption, and the specific gravity . . . 210 



Accuracy may be equally relied upon whether one or more 

 particulars are required. No. 9 would frequently exhibit all the 

 essential constituents of the soil. No. 10 would supply (except 

 in some unusual cases) abundant information for any practical 

 purpose. In any analysis of a more complicated kind^ as where 

 separate statements of the composition of the sand^ of the mi- 

 nutely divided matter, and of the soluble contents, are required^ 

 the cost will be increased in proportion. 



III. — On the Rackheath Sub- Turf Plough. By Sir Edward 

 StraceYj Bart., F.R.S. 



The Rackheath Sub-Tukf Plough : invented by Sir Edward Stracey.* 

 To the Secretary, 



Sir, 



In consequence of the applications of many of my friends for a 

 sketch of my Sub-Turf Plough I send you herewith such sketch. 



* Manufactured by Barnard and Joy, Norwich. 



