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It imparts to grass a great vigour, but at the 

 same time, it is said, a taste repugnant to ani- 

 mals. Boussingault, in his observations, has 

 not verified this assertion. Sahiion succeeded 

 in completely disinfecting fascal matters by 

 mixing them with the carbonaceous product 

 of the calcination, in close vessels, of a calca- 

 reous earth containing organic matters, the 

 nitrogen of which adds itself to that of the 

 manure. It is the '' aiilmalized black.'' On 

 the next page is given the plan of a fur- 

 nace for the preparation of this black. 



Fig. 1. is a vertical cut, fig. 2. a horizontal 

 cut of the furnaces. The same letters in the 

 two indicate the same objects; a, the hearth 

 whereon the combustible is placed, by the ash 

 pan ; c, a bed for the reception of the matter 

 to be calcined ; d, a vent hole establishing the 

 communication between the furnace c c and 

 its lower gallery a a. It is seen, in fig. 1, that 

 the vent hole is in each side of the kiln; e, 

 the gallery under the hearth of the furnace, 

 into which the products of combustion enter 

 in passing out of the furnace, and again heat 

 the hearth by contact; f, the orifice opening 

 through the arch of the furnace, closed 

 by an iron plate, and serving as an inlet for 



