The Monoclinic Pyroxenes of New York State. 125 



A constant difficulty all through the work has been the lack of 

 fresh material for chemical and optical work, so that crystallo- 

 graphic portion of the paper predominates. 



The writer wishes to express his thanks to Prof. Thos. Egles- 

 ton, Prof. A. J. Moses and Dr. L. M. Luquer for numerous help- 

 ful suggestions offered during the course of the work. Grateful 

 acknowledgments are also due to Prof. J. P. Kemp for much 

 valuable aid, and for the use of some excellent material for study. 

 Prof. Wm. Hallock and Prof C. E. Colby have also aided the 

 writer considerably. To Prof. C. H. Smyth, Jr., the writer is in- 

 debted for the loan of many specimens. 



Literature. 

 The following list includes all papers referring to the mono- 

 clinic pyroxenes of New York State, the more important miner- 

 alogical ones being marked with an asterisk. 



1. Bailey, S. C. H. — On the Minerals of New York Island. Ann., N. Y. 

 Lyceum Nat. Hist., vol. VIII, Nov. 1865. 



2*. Beck, L. C. — Keport on the Mineralogy of New York State, Albany^ 

 1846. 



3*. Blum. — The alternation of pyroxene to mica. Pseudomorphosen, 3d, 

 nachtrag, p. 93, 1863, and p. 163, 1843. 



4*. Beewee. — Analysis of Pyroxene from Edenville. Liebig's-Kopp's 

 Jahresber, p. 712, 1850. 



5. Beuce. — White Pyroxene from New York Island. Brace's Min. Jour., 

 p. 266, 1814. 



6. Cleveland. — Mineralogy. Appendix. 



7. Crawe, J. "W. AND A. Gray. — Mineralogy of Jefferson and St. Law- 

 rence Co., New York. Amer. Jour. Sci., ii, vol. XXV, p. 346 and Neues 

 Jahrb. fur Min., p. 83, 1835. 



8*. Dana, E. S.— System of Mineralogy, 1893. 



9. Dana, J. D. — Note on Hudsonite. Amer. Jour. Sci., ii, vol. XIX, p. 

 362. 



10. Dana, J. D. — Leucaugite from Amity, N. Y. Amer. Jour. Sci., iii, 

 vol. VI, p. 24. 



11*. Des Cloiseaux. — Note on Hudsonite. Mineralogie, p. 62, 1863. 



12*. Des Cloiseaux. — On Pyroxene from Orange Co., Manuel de Miner- 

 alogie, vol. I, p. 54, 1862. Atlas Fig. 57 and 58. 



13*. DOELTEE, C. — Ueber Diopsid. Tscher. Min. Mitth., N. F., vol I, p. 

 55 and 



14.* DoELTEE, C. — Diopside from Greenwood Furnace. Tscher Min. 

 Mitth., 1887, p. 286. 



15. Eakle, a. S. — On some dikes occurring near Lyon Mt., Clinton Co., 

 N. Y. Amer. Geol., vol. VII, July, 1893. 



