﻿384 MUSGRAVE AND RICHMOND. 



curves would have been confusing. The curves as they are given only 

 approximate the desired results, but they are accurate enough for all 

 practical purposes. 



These being the data, the following example is explanatory : For an 

 average child six weeks old we desire a milk of the following com- 

 position : 8 



Per cent. 



Fat : 4 



Sugar 7 



Proteid 1 1 



We may start with either the desired proteid or fat content. Let us 

 take the proteid simply because these curves lie closer together and it is 

 easier to differentiate at the beginning. For 1 per cent content we have 

 two possibilities, either the curve which terminates in the 40 or the one 

 in the 35 cubic centimeters of total mixture of milk and cream to be 

 diluted to 100 cubic centimeters. Let us first consider the former. If 

 we follow the fat curve for this mixture to 4 per cent, the ordinate at 

 that point does not cross the proteid curve at the desired point, namely, 

 1 per cent. If on other hand we take the fat curve for the 35 cubic 

 centimeter mixture and follow it to 4 per cent, we find the ordinate to 

 cut the proteid curve at 1 per cent content, and this shows us the proper 

 relation to be 27-J cubic centimeters of milk and 7-| cubic centimeters of 

 cream. Now the sugar of milk curve which terminates on 35 cubic 

 centimeters intersects the chosen ordinate 27-| at 1.6 per cent. This 

 gives us the sugar content of the mixture of milk, cream and water. We 

 desire 7 per cent. It is necessary then to add as many grams of sugar of 

 milk, as . the difference between the desired and actual sugar content, 

 namely, 7 minus 1.6 or 5.4 grams per 100 cubic centimeters. Therefore 

 the desired amounts of each are as follows ; 



Water cubic centimeters.... 65 



Milk , _ do 27* 



Cream .:.-. do 7* 



Sugar of milk grams.... 5.4 



If a pure cream with a fat content other than that which is the basis 

 of the chart, 9 namely 38 per cent, is used, then a correction in the quanti- 

 ties of milk and of cream as given above is necessary. If a cream with 



s Roteh, T. M.: Pediatrics (1906), 196. 



"Two such samples have recently appeared on the Manila market namely "Na- 

 tura" and "Butterfly Brand." The analyses of single samples of these made by 

 this Bureau are as follows: 



.' Natura. Butterfly. 



Fat 27.1 26.95 



Sugar :„.-. - 2.3 4.00 



Proteid '. 2.4 3.51 



