a) Hornblende from qunrtz-monzonite, S. E. Mt. Hoffmann, Cal. ; rock 

 analysis Uoiti qnartz-monzonite lyr.uio-toscanose), Nevada Falls Trail, 

 Yoscmite Valley, Cal. (average rock of region). Dull. /OS U. S. Geol. 

 Surv., p. 208, and AJ.S., Vol. VIi;(i8i)g) t p. 297. 



h) Hornblende from qnartz-monzonite (grano-amiatose), Walkcrville Sta- 

 tion, Butte, Mont. Bull. ib8, U. S. Geol. Srtrv.', p. 116. 



r) Hornblende (green) from dacite, Grenatilla, rock analysis from horn- 

 blende-dacite (bandose), San Pedro, Sierra del Cabo, Cabo de 

 Gata, Spain, Rosenbusch, El. Gest., pp. 285, 286. • 



if) Hornblende from quarts- diortte (grano-camplonose), 46 miles south of 

 Table Mountain, Cal. Bull, ib8 U. S. Geol. Surv., p. 190. 



*AI„O a and TiO., estimated from rock analysis. A1._,0., determined as 17.65 including TiO a . 



e) Hornblende from hornblende- gabbro (grano-hessose), Beaver Creek, Big 



Tree Quadrangle, Cal. A.J. S , Vol. VII (1899), p. 297. 

 /. Hornblende from andesite (umptekose), Stenzelberg, Siebengebirge, 



RosENiiusch. El. Gest., pp. 290, 292. 

 g. Hornblende from " hornblende- diabase," Graveneck, near Weilberg. 



Rosenbusch, El. Gest., p. 306. 

 //) Hornblende from syenite, Biella, Piedmont. Italy, Rosenbusch, El. Gest., 



pp. 103, 106. 

 i) Hastingsite (deep blue) from ne/helite-syeui/e, Dunganon, Ontario, 



Rosenbusch, El. Gest., p. 122. 

 j. Barkevikitc from sodalite-syenite (grano-pulaskose), Square Butte, Mont. 



A . J. S., Vol. XLV, 1893, p. 292. 



TABLE XHIa. MOLECULAR RATIOS IN AMPH1BOLES. 



k) Riebeckite from granite (grano-Hparose), Quincy, Blue Hills, Mass., 

 A.J. S., Vol. VI, 1898, p. 181. 



/) Katophoriit from sanidinite, San Miguel, Azores, Rosenbusch, EL 

 Gest., p. 266. 



m) Arfvedsonite from nephelite- syenite, Kangerdluarsuk, Greenland, 

 Rosenbusch, El. Gest., p. 122. 



n) Cossyrite (ainigmatite) from pantclleritc (felso-varingose) Khartibugal, 

 Pantellaria, Rosenbusch, El. Gest,, p. 257. 



o) Ainigmatite from nephelite-syeuite, Julianehaab, Greenland, Rosen- 

 busch, El. Gest., p. iZ2. 



/) Amphibole from comendite (felso-liparose), San Pietro, Sardinia, Rosen- 

 busch, El. Gest., p, 257. 



, Mg, Fe, calculated ; 

 , is that required to n 



: part of the sali' 



2 Femic Ca, Mg, Fe, calculated partly ; 

 components to leucite or nephelite. 



