2 Oleum Sinapis Volatile. Distilled from the seeds after macer- 

 ation with water. Colourless or pale yellow oil, with an intensely pene- 

 trating odour and an acrid taste; almost immediately vesicates the skin. 



3 Linimentum Sinapis. 4; Camphor, 6; Castor Oil, 14; Al- 

 cohol, 86. 



SODIUM. SODIUM. The metal of commerce. 



The incompatibles of the salts of sodium do not depend upon the sodium 

 but upon the other radicles present and may be found by looking up these. 



*Soda Tartarata. Sodium Potassium Tartarate. (Rochelle Salt.) 

 Dose, .120-240 grs.; 8-16 gms. 



(CHOH) 2 COONa.COOK, 4H 2 O. Crystals, colourless, with a saline 

 taste. Soluble 1 in 1^ of water, insoluble in alcohol. 



1 Pulvis Sodae Tartaratae Effervescens. (Seidlitz Powder.) 

 Dose, the two powders mixed in water. (1)-120; Sodium Bicarbonate, 

 40 grs. (in blue paper). (2) Tartaric Acid, dried, 38grs. (in white paper). 



2 Sodii Arsenas. Sodium Arsenate. Dose, 1/40-1/10 gr.; 1.5-6 

 mgms. 



An anhydrous disodium hydrogen arsenate, Na 2 HAsO 4 . A white powder. 

 Soluble 1 in 6 of water, (solution has an alkaline reaction). Slightly 

 soluble in alcohol. 



3 Liquor Sodii Arsenatis. Dose, 2-8 min.; 0.1-0.8 c.c. 

 1; Water, 100. An alkaline solution, 



2 Sodii Benzoas. Sodium Benzoate. Dose, 5-30 grs.; ^-2 gms. 

 A white, crystalline or amorphous powder, inodorous, or with a faint 

 odour of benzoin, and an unpleasant sweetish saline taste. Soluble 1 

 in 2 of water, 1 in 24 of alcohol. 



a Sodii Bicarbonas. (Baking Soda). Dose, 5-30 grs.; X-2 gms. 

 NaHCOs. In powder or small, white crystals, with a saline taste. Soluble 

 1 in 11 of water, insoluble in alcohol. 



3 Trochiscus Sodii Bicarbonatis. 3 grs. with the Rose Basis. 



^odii Bromidum. Sodium Bromide. Dose, 5-30 grs.; J^-2 

 gms. 



NaBr. Small, white crystals somewhat deliquescent, inodorous, with a 

 saline taste. Soluble 1 in 1.2 of water, 1 in 16 of alcohol. 



a Sodii Carbonas. (Washing Soda). Dose, 5-30 grs.; J^-2 gms. 

 Na2COs,10H2O. Transparent, colourless crystals, efflorescent, with a 

 harsh taste, and a strongly alkaline reaction. Soluble 1 in 2 of water. 

 10 parts neutralise 4.9 parts of citric acid or 5.75 parts of tartaric 

 acid. 



94 



