162 Proceedings. 



Cambridge, Mass. — Harvard College Observatory: A Plan for the Extension 

 of Astronomical Research. 

 Museum of Comparative Zoology: Bulletin, Vol. xii, Nos. 3-6. 

 Champaign^ III. — State Laboratory of Natural History: Bulletin, Vol. ii, 



Art. IV. 

 Chapel Hill, N. C— Elisha Mitchell Scientific Society: Journal for 1884-5. 

 Charleston, S. C. — Elliott Society of Science and Art: Proceedings, Vol. ii, 



pp. 41-80, 1860. 

 Cincinnati, 0. — Society of Natural History: Journal, Vol. viii, No. 4; Vol. 



IX, Nos, 1, 2 and 3. 

 Davenport, la. — Academy of Natural Sciences: Proceedings, Vol. iv, 1882-4. 

 Denver, Col. — Scientific Society: Proceedings, Vol. i, Pt. 1. 

 Iowa City, la. — State Historical Society: Historical Record, Vol. ii, Nos. 1-3. 

 Laming^ Mich. — Michigan Agricultural College. State Board of Agriculture : 



Bulletins, 10-21; 24th Annual Report, 1884-5. 

 Madison, Wis. — State Historical Society: 32d Annual Report. 

 New York, N. Y. — American Geographical Society: Bulletin, 1882, No. 6; 



1883, No. 7; 1884, No. 5; 1885, Nos. 2 and 3; 1886, No. ]. 

 New York, N. Y. — American Museum of Natural History: Annual Report, 

 1885-6; Bulletin, Vol. i. No. 7, 1886. 

 New York Microscopical Society: Journal, Vol. i, Nos. 8 and 9; Vol. ii, 

 Nos. 1, 2, 3, 5 and 7. 



Torrey Botanical Club: Bulletin, Vol. xiii, Nos. 1-11. 

 Philadelphia, Pewn.— Academy of Natural Sciences: Proceedings, 1885, Pt. 3; 

 1886, Pt. 1. 

 Second geological Survey of Pennsylvania: Annual Report, 1885. 

 Report, A. History of the First Geol. Sur. Penn., from 1836 to 1858, 1876. 

 " AA. Second report of progress of the anthracite survey, 1885. 

 " A2. Causes, etc., of waste in anthracite mining, 1881. 

 " AC. Report on mining methods in anthracite fields, 1883. 

 " C. Report on York and Adams counties, 1876. 



" CC. " " " " " (Iron ores, etc.) 1877 



" CCC. " Lancaster county, 1880. 



" C4. " Chester county, general description, 1883. 



" C5. " Delaware county, Pt. 1, 1885. 



" C6. " Philadelphia and counties near, 1882. 



" DD. Second report on Lehigh county iron mines, 1878. 

 " D3. Vol. 1, Report on Lehigh and Northampton coimties, 1883. 

 " D3. " II, Pt. 1, Report on Berks county, 1883. 

 " E. Pt. 1, Trap dikes and Azoic rocks, 1878. 

 " F. Report on the Juniata river district, 1878. 

 " F2. Pt. 1, Geology, Report on Perry county, 1884. 

 " G. Report on Bradford aud Tioga counties, 1878. 

 " GG. " Lycoming and Sullivan counties, 1880. 



" GGG. " Potter county: Report on its coal fields, 1880. 



" G4. " Clinton county, 1880. 



" G5. " Susquehanna and Wayne counties, 1881. 



" G6. " Pike and Monroe counties, 1882. 



