TESTIMONY OF BENJAMIN SILLIMAN. 113 



refer to the accuracy of the hydrometer as used in various liquids, 

 do you use the term accurate as referring to a degree of accuracy, 

 or as to the determination of the fact itself of density in other 

 words, if the question is whether or not a fact exists, will the word 

 accurate give your opinion correctly ? 



(Objected to ; objection sustained.) 



Q.. You say you tested the lactometer used by the Board of 

 Health ? A. I used it, not tested it. 



BENJAMIN SILLIMAN, sworn and examined by Mr. PBENTICE, testified 

 as follows : 



Q. You are a chemist by profession ? A. I am. 



Q. You have also taken a degree of doctor ? A. I hold the de- 

 gree of doctor, but I am not a practising physician. 



Q. How long have you been in the profession of chemistry, 

 and what has been your experience ? A.. I have been in the 

 profession of chemistry since 1837, at which time I became an 

 assistant in the department of chemistry under my father at Yale 

 College, where I remained until 1847, when I became professor of 

 chemistry applied to the arts in the scientific school at Yale Col- 

 lege ; I then held that chair until 1849, when I added to it the 

 appointment of professor of medical chemistry and toxicology in 

 the university of Louisville, Kentucky ; I held the two chairs 

 parallel until 1855, when I resigned the Kentucky appointment, 

 returning permanently to New Haven, where I have since, until the 

 present time, resided as professor of chemistry in Yale College, and 

 at present specially connected with the medical department of that 

 institution. 



Q. You are one of the editors of the scientific journal known as 

 Sillimans Journal ? A. I am. 



Q. And you are acquainted with the milk question, so called ; the 

 literature upon it and the general subject ? A. I am. 



Q. You are acquainted with this class of instruments called 

 hydrometers and the lactometer ? A. Yes, sir. 



Q. Which is used in testing specific gravity in milk ? A. Yes, 

 sir. 



Q. Is milk a defined chemical compound ? A. It is not ; milk 

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