TESTIMONY OF GEORGE C. CALDWELL. 81j 



Q. The lactometer is for determining the specific gravity of 

 milk? A. It is. 



Q. Is there any more accurate method of determining the specific 

 gravity of liquids than by the use of such instruments ? A. Not 

 when they are properly constructed and proper precautions are 

 used. 



Q. In your opinion is the standard 1.029, that adopted by the 

 Board of Health, a correct and safe one ? A. It is. 



Q. In connection with the lactometer it is proper to use the 

 thermometer? A. It is. 



Q. And what degree of heat should the milk be for the practical 

 test with the lactometer? A. Any degree that is agreed upon; 60 

 Fahr. is the usual temperature and is the one most usually reached. 



Q. If we have a sample of what is called commercial milk, milk 

 found in the city offered for sale at a temperature of 60 Fahr., which 

 shall show upon the lactometer a degree of say 90, what will that 

 determine if anything ? A. It will determine that some liquid light- 

 er than normal milk had been added to it. 



Q. I ask your experience what would be the adulteration ? A. 

 Water. 



Q. You are acquainted with the literature on this subject gen- 

 erally, are you not ? A. I am acquainted with some of it. 



Q. What is the best opinion according to the best authorities 

 with regard to the use of the lactometer for detecting the watering 

 of milk? 



(Objected to ; objection overruled ; exception.) 



A. My opinion is that there is good authority for the use of the 

 lactometer for detecting excessive watering of milk. 



Q. You yourself have published papers on dairy products and 

 on milk, have you not? A. I have, sir. 



Q. And have you recommended the lactometer for use by dairy- 

 men ? 



(Objected to ; objection sustained.) 

 Cross-examined. 



Q. Doctor, you say you have made some special study of milk from 

 dairy products ; what do you mean by that ? A. I have analyzed 

 .milk, studied its composition in that way ; I have read some works 

 on milk. 



