TESTIMONY OF JOHN BLAKE WHITE. 17 



By Mr. HASTINGS Q. And this is the one you received from the 

 Board of Health, did you ? A. Yes, sir. 



Q. And what is the standard at which it is graduated ? A. At 

 the specific gravity of 1.029. 



Q. What is the specific gravity adopted by the Board of Health ? 

 A. 1.029 is the lowest, which is equal to 100 upon the lactometer 

 scale. 



Q. Now, sir, explain the manner and use of the lactometer, and 

 its theory ? 



(Objected to ; objection overruled ; exception.) 



A. The lactometer is an instrument used to test the specific 

 gravity of any fluid, and it is called a lactometer because it is used 

 to test the specific gravity of milk. 



Q. How do you use it in testing milk ? A. It is placed in a 

 glass containing the fluid. 



Q. And then what ? A. The fluid should stand at the tempera- 

 ture of 60 degrees Fahrenheit. 



Q. Does this sink ? A. And that sinks and indicates upon the 

 scale there the specific gravity of the fluid in which it sinks to that 

 point. 



Q. Does the temperature have any effect ? A. The temperature 

 does, for I have just stated the temperature of the milk should be 

 at 60 degrees Fahrenheit. 



Q. Now, sir, you have made a great many tests and experiments 

 with the lactometer, have you ? A. I have, sir. 



Q. Have had large experience in its use ? A. Yes, sir. 



Q. From your experience and your tests, have you determined 

 it to be a reliable instrument in testing 'the specific gravity of 

 milk? 



COUNSEL Objected to. 



The COURT I cannot exclude this question and answer. You 

 can cross-examine as much as you have a mind to. 



A. I have. 



Q. State what tests and what methods you have used for de- 

 termining its reliability by comparison or otherwise, by analysis or 

 in whatever way ? A. I have tested it in solutions of known specific 

 gravity in which it indicated the specific gravity a solution which 

 I had previously known. 



