122 TESTIMONY OF BENJAMIN SILLIMAN. 



gravity of milk ? A. I have in my memory instances recorded of 

 that fact. 



Q. In your own knowledge ? A. No, not of my own experimen- 

 tal knowledge. 



Q. How much of your testimony on your direct examination was 

 based upon your personal knowledge ; was it all ? A. The testimony 

 upon my direct examination was based upon my general knowledge. 



Q. Was there more than a small portion of your testimony 

 upon your direct examination based upon your personal knowledge ? 



The COUBT I will exclude the question. 



COUNSEL I except to its exclusion. 



Q. "Was there one-half of your direct evidence based upon your 

 personal knowledge ? 



The COURT That I will exclude. 



Q. You mentioned certain authorities, Quevenne, Bouchardat, 

 and Yon Baumhauer, will you state or point out which one of those 

 recommends the use of the lactometer as the best test for milk ? 

 A. I made no statement of that kind. 



Q. What did you say about them ? A. The stenographer's re- 

 cord of my answer will state. 



Q. Professor Silliman, I hand you a copy of a book, Du Lait, by 

 Quevenne and ask you to point out the portions to which you refer. 

 Have you consulted Quevenne's book? A. I have consulted it. 



Q. Will you point out the passages you referred to in your direct 

 examination ; you stated that book to be by Bouchardat ? A. I 

 said that the book was by Bouchardat and Quevenne, which state- 

 ment is true in general ; the introductory part was originally by 

 Quevenne alone ; they jointly edited the book ; it is dated Paris, 

 1857. May it please the Court, the introductory portion of this 

 book which describes the lacto-densimeter occupies thirty-two 

 pages altogether ; I will therefore briefly state the points and read 

 but one or two extracts, translating from the French. After giving 

 the general instructions upon page 2 for the guidance of those who 

 would make observations upon milk, the author says : " The differ- 

 ent instruments therefore employed for the weighing of milk only 

 sufficiently fulfil their end." Quevenne has attempted to establish the 

 lacto-densimeter with the table of corrections with which he accom- 

 panies it ; he states that the commission with whom he was associ- 



