l8 HENRY S. WASHINGTON 



Classification. — The norms of the preceding analyses, on which 

 their classification according to the quantitative system depends, are 

 shown in the adjoining table. 



Norm of I Ratios of I 



Or 5.00 Sal 58.17 



Ai ^ ^ — = =1.41. Class III, saliemane. 



Ab 20.20 Fern 41.34 ' 



An 26.97 F 58.17 



Di 13.63 q;X^'~o~^°°' Order 5, gallare. 



J?f--- ^°-^° Klo + Na.O 59 , ^ 



01 5-31 r^o^ ^07'"° Rang 3, camptonase. 



Mt 4.87 ^' 



Tl A K2O 9 



^^ 0.23 — — — = — =0.18. Subrang 4, camptonose. 



Ap 1 .00 ^ ^ 



Rest o. 75 Symbol, III. 5. 4-3. 4. 



100.26 



Norm of II Ratios of II , 



r^ t- ^ — =^ = 1.20. Class III, salfemane. 



Or 5.56 Fern 44.79 



Ab 20.44 F 52.13 



An 26.13 Q = 7:^=36.2o. Order 5, gallare. 



?; '^-9° K30 + Na.O 49 



Hy 20.03 CaCy ^qa^^'^^" Rang 4, auvergnase. 



Mt 3.02 ^ 



Tl /; o K2O 10 ^ o 1 



■•■i o.«4 — — -= — =0.26. bubrang 4-5, auvergnose. 



4^ Na^O 39 6 t 0, 6 



Ap 1 .00 ^^ 



Rest 1 . 19 Symbol, III. 5. 4. 4-5. 



99-55 

 It is evident that both fall well within the salfemane class and the 

 perfeHc order gallare, though a very small amount of quartz is present 

 in the norm of II. As regards the rang, which is based on the rela- 

 tions of the alkaHes to saHc Ume, I falls in the alkahcalcic division, 

 camptonase, but so close to the border of the docalcic order auverg- 

 nase that it must be considered transitional. II falls within the docal- 

 cic order auvergnase, but it may be noted that this position is due to 

 the abstraction of the soda to satisfy the chlorine, present as sodium 

 chloride derived from sea-water, and that, were this not determined, 

 the rock would fall also in the alkalicalcic order camptonase, where 

 it was placed when this analysis was published previously. This 

 rock must therefore also be regarded as transitional. The subrang 

 is, in every case, distinctly sodic, so that I is to be called auvergnose- 



