RICHARDS AND WELLS. 



TRANSITION TEMPERATURE. 



447 



labelled V, recrystallized three times. The temperature measurements 

 are recorded in the usual fashion, and need no further interpretation. 



Final Measurements. 



Thus, the three final determinations, made with three different ther- 

 mometers from two makers, and with two different specimens of salt, 

 at widely different times, gave as results respectively, 50.674°, 50.675°, 

 50.673°. The remarkable agreement of these results must be partly 

 accidental, because the extreme divergence is less than the possible 

 divergence from accuracy of each single determination. The mean, 

 50 674°, may be taken as representing very nearly the true transition 

 temperature of the salt, on the international hydrogen scale. 



In conclusion, it is a pleasure to acknowledge our indebtedness to the 

 Rumford Fund of the American Academy of Arts and Sciences for 

 pecuniary aid in carrying on this investigation. 



