296 Dr. J. Hopkinson on the [June 14, 



Light Flint Glass. — -Determinations made from three angles, 

 density =3-20609. 



a= 0-583887. 5=1*9605. c=+0-53. 





B. 



C. 



D. 



E. 



b. 



F. 



Most probable value of p, 



1-568558 

 1-568553 



1-570011 

 1-570009 



1-574015 

 1-574017 



1-579223 

 1-579226 



1-580271 

 1-580274 



1-583886 

 1-583887 



Mean of observed values 



1-568558 



1-570007 



1-574013 



1-579227 



1-580273 



1-583881 







(G.) 



G. 



h. 



H, 







Most probable value of n 



1-592190 

 1-592185 



1-592824 

 1-592815 



1-597332 

 1-597322 



1-600727 

 1-600724 



Mean of observed values 



1-592184 



1-592825 



1-597332 



1-600717 



Dense Flint.— Determinations from three angles, density=3 # 65865. 

 a=0-634744. 6=2-2694. e=l*48. 





B. 



C. 



D. 



E. 



b. 



F. 



Most probable value of fi 



1-615701 

 1-615700 



1-617484 

 1-617488 



1-622414 

 1-622427 



1-628895 

 1-628904 



1-630204 

 1-630210 



1-634748 

 1-634744 



Mean of observations . . . 



1-615704 



1-617477 



1-622411 



1-628882 



1-630208 



1-634748 







(G.) 



G. 



h. 



H r 







Most probable value of [x 



1-645267 

 1-645258 



1-646068 

 1-646060 



1-651840 

 1-651837 



1-656219 

 1-656222 



Mean of observations . . . 



1-645268 



1-646071 



T651830 



1-656229 



