M.-P.— Vol. I.] CRAWFORD— CONSTANT OF REFRACTION. 



167 



The following tables contain the reductions for dlogr or 

 its equivalent dloga. The second column contains the 

 logarithms of the computed refractions; the next column 

 contains the logarithms of the observed refractions; the 

 fourth the difference between the two preceding, in the 

 sense of Observed — Computed; the column^ contains the 

 weights and the last column the weighted differences. 

 The residuals and their weighted squares are not given. 

 Log \_-pvv\ is given in every case, as is also the resulting 

 probable error of the weighted mean of every set. All of 

 the results in the following tables have been checked. 



A I 



0.00205 



[p] = 5o l A ; log [pvv] = 5.8653 



p. e. = ^ 0.00015 



