188 TESTIMONY OF ROBERT OGDEN DOKEMUS. 



By Mr. LAWEENCE Q. The addition of that quantity of water to 

 that quantity would diminish its gravity? A. Yes, sir. 



Q. Why would not that be sufficiently determined by the lacto- 

 meter and the thermometer and the senses ; what difficulty would 

 present itself? A. Because of milks varying in their chemical 

 constitution. 



Q. In what way ? A. Those which contain a large amount of 

 cream wall have the tendency to allow the lactometer to sink, and 

 unless you knew the chemical constitution of each milk, you could 

 not predict what it would be. 



Q. Dr. Doremus, ought the lactometer to be correct at all points 

 at which it is intended for use ? A. It certainly should ; especially 

 where reputation is involved. 



Q. If it is the sole instrument, with the senses, to be used, 

 is it important to use the thermometer in using the lactometer to 

 test milk, and, if so, why ? A. Unquestionably ; as when the milk 

 is warm it expands and is lighter, and the instrument must sink to 

 a greater depth, and when it is cold the reverse ; that is patent, 

 and has already been shown. 



Q. Now, can you refer to one of these tables on that subject, I 

 think if I direct your attention to the second, to show the import- 

 ance of using the thermometer ? 



(Objected to.) 



Q. Have you been present in Court, Professor Doremus, and 

 heard the evidence of most of the witnesses for the prosecution? A. 

 I have, sir. 



Q. You heard the evidence of Dr. White, did you not ? I did, 

 sir. 



Q. Now, what is your opinion of the lactometer, as used by the 

 Board of Health in conjunction with the thermometer and the 

 senses, as a test for the adulteration of milk by water ? A. I con- 

 sider it unreliable. 



Q. Why, sir ? A. I consider it unreliable ; and where it, with 

 the thermometer and the senses, is solely used to determine the 

 value of a milk, I would hold myself 



The COURT Excuse me, Dr. Doremus, that is not the question. 



By Mr. LAWRENCE Q. Well, as to adulteration of milk by 

 water ? A. It is unreliable as a means for determining the adul- 



