WARREN. — ALKALI-GRANITES A\D PORPHYRIES. 



'I'H 



1. Medium gray granite, Hitchcock Quarry, N. Common Hill, Quincy, 

 Mass. Analyst, C. H. Warren. 



2. Very dark granite, Reinhalter Quarry, West Quincy, from about 300 ft. 

 below surface. Analyst, C. H. Warren. 



3. Medium dark granite, Hardwick Quarry, N. Common Hill, Quincy, 

 Mass. Analyst, H. S. Washington. 



4. Average of 1, 2, and 3. 



5. Slightly porphyritic phase from near contact with granite-porphj'ry. 

 Quarry N. side of Rattlesnake Hill, Blue Hills, Reservation, Analyst, C. H. 

 Warren. 



6. 7 and 8 are taken from Rosenbusch's Elemente d. GesteinsJehre, 1910 

 Ed., p. 86, and are as follows: — 



25 Assumed to be the same as in 1 and 2. 



Fluorine though present in small amount was not estimated. 



26 From 0.1 to . 28 or an average of . 19% of this is present as CaCOs, see 

 Dale, loo. cit., p. 94. 



