246 SOILS AND MANUEES 



shown later can be produced by mixing, or the simul- 

 taneous use of several substances, but cannot be obtained 

 in any other single artificial manure. By mixing to- 

 gether superphosphate, mineral phosphate, and sulphate 

 of ammonia in suitable proportions, a compound manure 

 could be produced containing soluble and insoluble phos- 

 phates and nitrogen in the same proportions as dissolved 

 bones, but as the solubilities of the ingredients would be 

 very different it could not be expected to produce the same 

 results. It is. therefore generally advisable to purchase 

 pure dissolved bones rather than a mixture or compound 

 manure at a price, perhaps, only a little lower. The 

 latter may have the same composition and may contain 

 a certain amount of bone, but cannot be relied upon to 

 possess the same graduated solubility. 



Dissolved bone is a very valuable manure. It acts 

 well on almost every class of soil, is suitable for all 

 crops that require phosphatic manures, and may be 

 applied either in autumn or spring. It is too expensive 

 to recommend for the ordinary purposes of the farm, 

 but has been largely employed for garden crops, for which 

 it appears to be particularly suitable. 



MEAT MEALS. 



In the preparation of meat extracts, the fat and bone 

 are separated, and the purely fleshy part of the tissue is 

 subjected to a process of prolonged boiling. When all 

 the soluble matter has been so extracted, the residue is 

 dried, ground to a fine powder, and sold as manure under 

 the name of flesh or meat meal, or sometimes meat 

 guano. Considerable quantities are produced at home, 

 and more is imported from abroad. The best known 

 variety comes from Freybentos, in Uruguay. 



Similar products are now made from slaughter -house 



