PRESOBIPTION WRITING 109 



Latin of sodium bicarbonate is sodium, genitive sodi-i, of 

 sodium; licarbonas, genitive Mcarbonat-is, of bicarbonate. 

 We will order a sufficient quantity of the ingredients to 

 make thirty powders. The dose of iron and nux vomica is 

 3 i. X 30 = § iii., 3 vi. The dose of sodium bicarbonate 

 is 3 ii. X 30 = § vii.ss. 



Fern sulphatis exsiccati 



Pulveris nucis vomicae. aa §iii., 3vi. 



Sodii bicarbonatis | vii.ss. 



Misce et divide in chartulas xxx. 



Translated : Mix and divide into papers xxx, 



(Abbreviated) M. et div. in ch't. xxx. 



Sig. Give one powder three times daily on the food. 



John Smith. 



In order to avoid the expense of having powders divided 

 into papers, we may frequently direct one dose to be 

 weighed by the druggist, and a measure to be furnished 

 holding the quantity. 



Ferri sulph. exsicc. 



Pulv. nucis vom aa § iii., 3 vi. 



Sod. bicarb 5 vii.ss. 



Misce et fiat pulvis. 

 Translated : Mix and let there be made a powder. 

 (Abbreviated) M. et f. pulv. (Furnish measure holding | ss.) 

 Sig. Give measureful on food three times daily. 



John Smith. 



To transform this prescription into terms of the metric 

 system: ^i. = Gm.30.; 3i- = Glm.4. Hence ^iii., 3vi. = 

 Gm.ll4; fviiss. = Gm.225. 



Solids in Gm. Liquids in Co. 



Ferri sulph. exsicc. 



Pulv. nucis vom aa 114 



Sodii bicarb 225 



M. et f. pulv., etc. 

 S. (as before). 



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