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MAGNESIAN LIMES RECOMMENDED. 



237 





and carbonated magnesia, that though these substances are in 

 this country sold at too high a price to admit of their being ap- 

 in the pure form by the farmer, however beneficial their 

 action may prove to be on this or that crop, yet that in some 

 parts of the world carbonate and hydrate* of magnesia occur so 

 abundantly as native minerals, that they can be procured at a price 

 which is almost nominal. A very pure white magnesian rock 

 of this kind has lately been imported from Smyrna, and em- 

 ployed in the manufacture of Epsom salts. With such sub- 

 stances as this, and especially where it naturally occurs, the 

 experiments I have recommended could be very easily per- 

 formed. 



* Hydrate means a combination of magnesia with water. Slaked lime is such 

 a combination with water, and is called by chemists hydrate of lime. 



