Solutions. 



(10) In ordering solutions for various purposes the proportions are so 

 evident that no difficulty arises, and the only point to be borne in mind 

 is the total quantity desired. Thus 



(a) Cocain Hydrochlor., 3 

 Aq. ad 60. 

 Sig 5 % Cocain Hydrochlor. 



(6)Argent. Nitrat., 1. 

 Aq. destil, 50. 

 Sig. 2% Silver Nitrate. 



Pills and Powders. 



(11) The procedure in ordering pills and powders must be somewhat 

 different from that hitherto described. The order for a pill or powder is 

 based on fractions or small multiples of the grain. The prescriber should 

 therefore become familiar with the: equivalence 1 grain =0.06 gram, which 

 is sufficiently exact for practical purposes. To facilitate the work of the 

 dispenser the number of pills or of powders ordered should be a multiple of 

 ten. Thus 



Recipe 



Aloin. 



Podophylli Resinae. 



Jalapae Resina?. 



Ext. Hyoscyami aa 0.015. M. ft, pil. 

 M. 10. 

 Sig. One after each meal 



For his pill mass the dispenser simply shifts the, decimal point of tht- 

 prescription. 



Linear Measures. 



(12) The equivalence 1 inch =2.5 c.m is used in practice. 



SUMMARY. 



(13) The procedure here recommended for the use of medical prac- 

 titioners may thus be summarized: ... 



(t/.) The prescription is still to be based on the single dose 

 136 



