EXPERIMENTS ON KAOLINIZATION. 



303 



Table VIII. records an uninteri-upted series of observations made by 

 Mr. Becker on the variation of Jt during an interval of three weeks 

 Table IX. contains the final check of the value of a. 



Table VIII. 



Jan. 4,21i> 

 Jan. 5, SI" 

 Jan. 5,21'' 

 Jan. 6, 7" 

 Jan. 6, 16' 

 Jan. 6,21i' 

 Jan. 7, 71' 

 .Jan. 7,17"' 

 Jan. 7,211' 

 Jan. 8, 7' 

 Jan. 8,15" 

 Jan. 8,201' 

 Jan. 9, 71' 

 Jan. 9,171' 

 Jan. 9,211' 

 Jan. 10, 7' 

 Jan. 10, 19* 

 Jan. 11, IS' 

 Jan. 11, 2011 

 Jan. 12, 71' 

 Jan. 12, 171' 

 Jan. 12, 211' 

 Jan. 13, 81' 

 Jan. 14, 71- 

 Jan. 14, n' 



Hrs. Bar. H't. 



23.25 

 23.25 



23.12 

 22.90 



0.024 

 0.033 

 0.033 

 0.044 

 0.042 

 0.042 

 0.042 

 0.041 

 0.044 

 0.044 

 0.043 

 0. 042 

 0.045 

 0.041 

 0.039 

 0.042 

 0.041 

 0.040 

 0.050 

 0.049 

 0.057 

 0.055 

 0.060 

 0.067 

 0.063 



Jan. 15, 

 Jan. 15, 

 Jan. 16, 

 Jan. 16, 

 Jan. 17, 

 Jan. 17, 

 Jan. 18, 

 Jan. 18, 

 Jan. 19, 

 Jan. 20, 

 Jan. 21 

 Jan. 21 

 Jan. 22 

 Jan. 22, 

 Jan. 23, 

 Jan. 23, 

 Jan. 24, 

 Jan. 24 

 Jan. 25, 

 Jan. 25, 

 Jan. 26, 

 Jan. 26, 

 Jan. 27, 

 Jan. 27, 



Table IX. 



22.94 

 23.29 



23.30 

 23.36 

 23.50 



22.92 

 23.15 



0.062 

 0.063 

 0. 067 

 0.068 

 0.003 

 0.064 

 0.068 

 0.060 

 0.063 

 0.021 

 0.016 

 0.043 

 0.048 

 0. 031 

 0.034 

 0.081 

 0.046 

 0.048 

 0.076 

 0.051 

 0.149 

 0.150 

 0.094 

 0.126 



In the foregoing determinations of a, the temperature t was chosen to 

 coincide as nearly as possible with that of the room. Though this arrange- 

 ment furnished important practical advantages {t varying but slightlv), only 



