"N'olcivno OsLima, Llzu. 35 



A B C D E 



FcO- 9.81 11.58 1-2.11: 10.20 10.95 



MgO 4.93 4.40 4.22 4.3<3 4.48 



■ CaO 10.54 10.83 10.85 10.51 10.71 



Na.O 0.77 1.30 1.52 1.44 1.23 



ICO 0.49 0.36 0.41 0.22 0.37 



H2O 0.43 0.95 1.00 0.49 0.72 



TiO, 1.53 1.01 1.01 1.44 1.27 



P0O5 0.89 trace trace 0.15 0.26 



MnO 0.21 0.25 0.29 0.03 0.19 



Total 100.01 100.01 100.25 99.46 99.96 



A Lava in April, 1912. 



B Lava in October, 1912. 



C Scoria in October, 1912. 



D Lava iu December, 1912. 



E Tlie average of the above four analyses. 



Osann's formulae. 



A B C DE 



s 57.69 56.24 56.26 57.10 56.84 



A 1.10 1.63 1.88 1.63 1.56 



C 8.66 8.68 8.81 9.52 9.15 



F 22.86 22.14 22.36 20.60 21.74 



a 0.67 0.97 1.14 1.03 0.96 



c 5.31 5.79 5..33 6.09 5.04 



/ 14.02 13.24 13.53 12.97 13.40 



n 7.06 8.40 8.62 9.20 8.33 



k 1.23 1.02 1.10 1.16 1.15 



Norms. 



ABODE 



Quaiiz 14.2 6.1 5.3 9.2 8.8 



Ortîioclaso 2.8 2.2 2.2 1.1 2.2 



Albito 6.3 11.0 13.1 12.1 10.5 



