SODIUM PHOSPHATE 141 



addition to Epsom salts, since it increases thirst and the 

 ingestion of water, and assists purgation in overloaded 

 conditions of the first and third stomachs of ruminants. 

 One-half pound of salt is administered to cattle with one- 

 half to one pound of Epsom salts, one-quarter pound of 

 ginger and a pint of molasses in two quarts of water. The 

 habitual ingestion of salt is prejudicial to ascarides and 

 diminishes the secretion of mucus in which they live. It 

 is even more efficacious in destroying oxyurides inhabiting 

 the lower bowels. Enemata containing 1 to 2 tablespoonfuls 

 of salt to the pint of water are employed for this purpose. 

 Salt should be constantly kept in the feed boxes of horses 

 and cattle. 



Animals convalescing from acute diseases, and those 

 with feeble digestion, need salt particularly. Horses are 

 commonly given a bran mash once a week, with plenty of 

 salt to enhance its laxative and hygienic action. Dogs 

 usually procure sufficient salt in their ordinary food, but it 

 should be added to their diet in the treatment of obesity. 

 Eepeated doses of salt aid the absorption of serous pleural 

 effusions. 



Sonn Phospeas. Sodium Phosphate. Na, HPO^ + l^H^O. 



(U. S. &B.P.) 



Synonym.— FhosTph&s sodicus (natricus), sal mirabile 

 perlatum, phosphate of soda, E.; natrum phosphoricum, 

 P. G.; phosphate de sonde, Fr.; phosphorsaures natrum, G. 



Derivation.— Digest bone ash with sulphuric acid. 

 Ca, 2P0, + 2 H, SO, = Ca H, 2 PO, (acid calcium phos- 

 phate) + 2 Oa SO,. Filter and add sodium carbonate to 



filtrate. ^^ 



Ca H, 2 PO, + Na, CO. = Na^H PO, + H,0 + CO + 

 Ca HPO,. Evaporate, and sodium phosphate crystallizes 



out. . . , 



Properties.— liarge, colorless, monoclinio prisms, odor- 

 less, and having a cooling, saline taste. The crystals 

 effloresce in the dry air and gradually lose 6 molecules of 



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