MANURE TANK. 



67 



heaps of decomposing manure. At the same time such 

 accessory fertilizers as gypsum, the various ammoniacal 

 salts, or soluble phosphates, or such deodorizing or fixing 

 elements as sulphuric acid, largely diluted, may be added 

 to the solution to increase its efficiency. 



The construction of the tanks will be here the chief 

 consideration. These, where the means are not ample, 

 may be of the rudest character consistent with the ability, 

 to hold and retain water, but otherwise they should be 

 constructed with a yiew to permanence and economy of 

 use. A cheap and simple tank, of which a section is 

 shown in fig. 30, may be made as follows : A pit or vat, 



Fig. 30. LIQUID MANURE TANK. 



d y is dug and cemented with water-lime or lined with 

 plank so as to be perfectly water-tight. This yat is cover- 

 ed with a plank floor, through which a wooden pump 

 passes, and rests upon the bottom of the tank. The size 

 of the yat of course will correspond with what is required 

 of it. A useful size for a market garden, or for a farm 

 where a few acres of soiling crops are raised each year, will 

 be 16 feet square and 8 feet deep. At the end of the yat 

 another excavation. is made sufficiently large to contain 

 the pile of manure or materials for a compost that can be 

 gathered and used. This excavation, seen at J, may be 



