COMMERCIAL FERTILIZERS. 



339 



similar way, and for similar reasons, as the fresh refuse lime 

 of gas-houses before applied. It would be of interest to learn 

 the specific action of a well-aired article on pear-trees, on 

 account of the large amount of oxide of iron it contains. 



Logwood-Ashes (Boston Dye-Works). 

 (Collected of Messrs. Horton & Phelps, Northampton, M;iss.) 



Moisture . 

 Volatile matter 

 Total phosphoric acid 

 Calcium oxide 

 Magnesium oxide ". 

 Potassium oxide 

 Insoluble matter 



Per cent. 



1.50 



3.90 



2.30 



53.28 



Trace. 



.08 



9.70 



The value of this recently introduced ash rests on its 

 phosphoric acid, and its high percentage of lime. The wood 

 which furnishes this ash had lost its potash by a previous 

 abstraction of its coloring-matter. 



Magnesium Sulphate. 

 I. 



fBowker Fertilizer Co., BoBton, Mass. ; collected of Massachusetts Agricultural College.) 



Per cent. 



Moisture • 23.70 



Magnesium oxide 18.20 



Calcium oxide 2.30 



Sulphuric acid 37.22 



Insoluble matter 7.55 



Water 



Sulphuric acid 

 Magnesium oxide 

 Calcium oxide 

 Insoluble matter 



n. 



(Sent on for I'xiiinination.) 



Per cent. 



7.50 

 41.85 

 18.26 



2.18 

 .40 



The superior fitness of this compound for the absorption 

 of ammonia in place of gypsum has not yet received that 

 attention ^Vhich it deserves. Its action on stem and leaf 

 growth ill case of forage crops, as clover, also calls ior home 

 experiments in that direction. 



