TESTIMONY OF GEORGE F. BARKER. 209 



the experiment ; if I made the experiment alone, entirely without 

 any outside interference, I would consider it reliable. 



(Question repeated.) 



A. I should not consider it safe. 



Cross-examined: 



Q. How many methods are there, Doctor, of ascertaining the 

 purity of milk ? A. I really do not know. 



Q. Is there any more certain .method of testing the purity of 

 milk than by the lactometer, which I understand you to say is only 

 a test of its gravity ? A. Yes, sir ; as to quality. 



Q. What is it ? A. The shortest method is analysis. 



Q. That is the shortest method of determining whether or not 

 milk is pure ? A. Yes, sir. 



Q. Then if you were to take, Doctor, a sample of milk and were 

 requested to determine whether it was pure milk, the surest method 

 of ascertaining whether it was pure milk would be by making analy- 

 sis ? A. Yes, sir ; with the same restrictions as before. 



Q. The lactometer is simply a test of the gravity of the milk ? 

 A. Yes, sir ; that is all. 



Q, And the surest method of ascertaining whether milk is adul- 

 terated or not is to make an analysis of it ? A. Yes, sir. 



He-direct : 



Q. In determining the adulteration of milk by water is the 

 analysis any more certain method of detection of impurity of this 

 kind without reference to the degree of impurity, than the lactome- 

 ter ? A. It would not. 



Q. The lactometer is just as sure a test of adulteration by water 

 as the analysis ? A. It is. 



He-cross : 



Q. If milk is adulterated with water it of course lessens its 

 gravity ? A. Yes, sir. 



Q. Then a lactometer when inserted would simply indicate what 

 the gravity of the milk was, and indicate that it was watered ? A. 

 Yes, sir. 



