28 MANURES. 



potatoes and corn. Tanner's waste should be treated in 

 the same way. Or either may be rotted by composting 

 them with manure, in the proportion of one part of shav- 

 ings or waste to fifteen parts of manure. 



Super-phosphate is a commercial manure, made by add- 

 ing sulphuric acid to burnt bones as used in the sugar 

 refineries, although it can be made from fresh bones. It is 

 somewhat uncertain in its effects in some soils, as it will 

 sometimes be inert the first season after being applied, 

 and only act the second year. Some manufacturers mis: 

 with it the blood and animal waste of the slaughter-houses. 

 This ensures its immediate action and adds greatly to its 

 value. 



Fish-guano is the dried refuse of the fish-oil manufac- 

 turers, finely ground. It is a powerful fertilizer, and is 

 also best used when composted with earth. 



Guano is well known as a powerful fertilizer. Its great 

 value consists in the amount of ammonia it contains. It 

 should always be used composted with earth, to which 

 gypsum or a weak solution of sulphuric acid has been 

 added, in order to change the ammonia from a volatile 

 state to a fixed and soluble one. It is immediate in its 

 effects. Never use ashes or any alkali with guano. 



Poudrette is the desiccated night soil from the cities. In 

 preparing it charred peat is generally used as an absorb- 

 ent. It is an excellent manure, producing immediate 

 ejects, and does not need composting. Unfortunately it is 

 not always of certain value, as the night soil from the 

 cities is often mixed with sand, coal ashes and similar 

 refuse. 



Hops, as the refuse of the breweries, when they can be 

 obtained, are a very powerful manure, by some considered 

 to be even more valuable than horse manure, They should 



