246 PROCEEDINGS OF THE ACADEMY OF [1880. 



21. S. Burgess, Can. Large brown crystal, purple 



on edges. (A. N. S.) 16°38'. 



22. Clark's Hill, near Rossie, N. Y. Brownish- 



yellow. (A. N.S.) 16°45'. 



23. Clark's Mills, N. Y. Light brown, transparent : 



(probably identical with Nos. IT, 20, 22). 



(A. N. s.) n°. 



24. Canada. Asteriated Phlogopite. 19°. 



25. S. Burgess. Clear yellow-brown. (A. N. S.) 19°. 



26. Burgess, C. W. Yellowish-brown crystals, with 



secondary cleavage along diagonal. (W. W. 

 Jefferis). 20°. 



2*1. Rossie, N. Y. Black by reflected, reddish- 

 brown by transmitted light. (A. N. S.) 21°13^ 



28. Vesuvius. Black, crumbling, very opaque, 



mixed with black hornblende. (A. N. S.) 21°20'±. 



29. Burgess, C. W. Asteriated, not transparent, 



silvery-brown. (A. N. S.) 21°35'±. 



30. Rossie, N. Y. Black by reflected, dark brown 



by transmitted light. Contains apatite. (A. 



X. S.) 22°. 



31. Chester Co., Pa. Feebly asteriated; locality 



wrong ? ; probably from Rossie, N. Y. (A. 



N. S.) 23°15'. 



32. Alamutchie,X. J. Clear reddish-brown. (Frankl. 



Inst.) 30°5'. 



33. Van Arsdale's Quarry, Bucks Co., Pa. Red- 



brown ; with graphite, etc. " 34°. 



Biotite. 



1. Easton, Pa. White, silver mica. 2°±:. 



2. Antwerp, N. Y. Greenish-white. 0°. 



3. Culsagee, N. C. White. 0°. 



4. Vesuvius. White. 0°. 



5. Darby, Del. Co., Pa. Deep red. 0°. 



6. Delaware Co., Pa. Crystal in muscovite ; black 



by reflected, brownish-red by transmitted light. 5°±. 



7. Scotland. Brown. 0°. 



8. Rossie, N. Y. Brown. 

 Probably several of these Biotites have an angle of l°-2°. 



o 



