No. 129.] 327 



the roots are stored perfectly dry and free from soil, even this 

 care is unnecessary-'''' 



He concludes by a statement of the cost of cultivation, which 

 it is not necessary to state, so great is the difference between their 

 labor and ours. The crop he estimated at twenty tons per acre. 



P"rom the same.] 



Analysis of Soot. — Oae ton, of 2,240 pounds of it, contains in 

 its natural state, 



lb. OS. 



Moisture, , , , , . ... 237 14 



Organic matter, 1002 H 



Chloride of ammonia, (sal ammoniac) 20 14^ 



Sulphate of ammonia, 80 3 



Chloride of sodium, (common salt,) 5 2| 



Chloride of potassium, 11 4^ 



Oxides of iron and alumina, 351 7^ 



Sulphate of lime (gypsum,), 237 9^ 



Phosphate of lime (bone earth) 11 13| 



Carbonate of lime, 25 4^- 



Lime (in a state of silicate) 51 4|- 



M igne.via do 8 11^ 



Soluble silica (combined with lime and mag- 

 nesia,) 89 141 



Insoluble silicious matter (chiefly sand.) 93 2h 



2,236 11 



[Acalcmie dea i-'ciences, TftriB.] 



Preservation of Milk. — M. Martin de Lignac has been the first 

 to do this well practically. He lives in a district abounding 

 in milk of the finest quality, and there has esiablished a man- 

 ufactory to prepare milk for the navy. He has a patent. A 

 large sheet copper pan, placed within a larger one containing 

 water. In the bottom of this outer pan is coiled a tube, pierced 

 with a great number of small holes. This tube communicates 

 with a steam boiler, the steam from which heats the water. 

 ■When the water is at the boiling point, fresh pure milk is poured 

 in, so as to cover the bottom about the third of an inch deep ; a 



