134 TESTIMONY OF HENRY A. MOTT, JR. 



HENRY A. MOTT, JR., sworn, and examined by Mr. Prentice. 



Q. Dr. Mott, will you state your profession ? A. I am an ana- 

 lytical chemist. 



Q. And what has been your study and experience ? A. With 

 respect to the subject of milk, I have devoted what I may say un- 

 divided attention to it for the last two years and a half, with a view 

 of publishing a very extensive work on the subject. 



Q. Have you already published some papers ? A. I have. 



Q. You are acquainted with the lactometer, I suppose ? A. I 

 am. 



Q. Have you made tests and experiments with it ? A. I have. 



Q. Is it an accurate instrument for determining the specific grav- 

 ity of milk ? A. Yes, sir ; when it is properly used. 



Q. Other similar instruments are used in the arts for, like pur- 

 poses, are they? A. Yes, sir. 



Q. Is there any more accurate method of determining the speci- 

 fic gravity of liquids than by the use of such an instrument ? A. 

 I have compared the result I have obtained from the lactometer 

 with the results I have obtained by actual weighing in the scales, 

 and they have agreed in every instance. 



Q. How many times have you done that, do you remember ? 

 A. I did that at least six times last winter. 



Q. This was in a case of milk ? A. Yes, sir ; in the case of 

 cows' milk. 



Q. You have examined the question of milk, generally ? A. I 

 have examined milk, generally. 



Q. And you have made comparative tests to determine the ac- 

 curacy of the lactometer you have already stated ? A. Yes, sir. 



Q. What do you understand by the specific gravity of milk ? 

 A. I understand by the specific gravity of milk, first, the result 

 obtained by comparing the volume with the known quantity of 

 milk, the weight of a known volume of milk with the weight of a 

 known volume of water, at the conventional temperature of 60 Fahr. ; 

 and secondly, I should have said when I speak of the specific grav- 

 ity of milk, I mean the specific gravity of all the milk that can be 

 obtained from a cow, in perfect health, thoroughly mixed together 



