OF ARTS AND SCIENCES. 



357 



+5709.7 = 49 



—134583.1 ==+519.64 a 



Combining results we have, giviiiji; the value of 6 in the first series 

 a weight of 1, and in the second series a weight of 3, 



b = —34.78 div. = —17.53 fi. 



COMPARISON OF LINE-METER fi/s WITH END-METER 5 IN 

 MELTING ICE WITH ONE-INCH OBJECTIVE. 



(Idiv. = 504ju.) 



Series I. 



