Part 20

=Nachtigal=, Sahara and Soudan.--Sah[)a]râ und Sûdan. Ergebnisse sechsjähriger Reisen in Afrika. Von Dr. GUSTAV NACHTIGAL. 3 vols. 8vo. Berlin, 1879–89.

N. Act. Ups.--Nova Acta Regiæ Societatis Scientiarum Upsaliensis. 4to. Upsaliæ.

Nature.--Nature, a Weekly Illustrated Journal of Science. 4to. London.

N. Comm. Ac. Petrop.--Novi Commentarii Academiæ Scientiarum Imperialis Petropolitanæ. 4to. Petropoli.

N. Dict. d’H. N.--Nouveau Dictionnaire d’Histoire Naturelle appliquée aux Arts. 8vo. Paris.

=Neumann=, Elephant-Hunting in E. Africa.--Elephant-Hunting in East Equatorial Africa. By A. H. NEUMANN. 8vo. London, 1898.

=Nicolls & Egl.= Sportsm. S. Afr.--The Sportsman in South Africa. By JAMES A. NICOLLS and WILLIAM EGLINGTON. 8vo. London, 1892.

N. L. M.--Notes from the Leyden Museum. 8vo. Leiden.

Novitat. Zool.--Novitates Zoologicæ; a Journal of Zoology in connection with the Tring Museum. Edited by the Hon. WALTER ROTHSCHILD, Ph.D., ERNST HARTERT, and Dr. K. JORDAN. Vol. V. 8vo. London, 1898.

Öfv. K. Vet.-Ak. Förh.--Öfversigt af Kongl. Ventenskaps-Akademiens Förhandlingar. 8vo. Stockholm.

=Oken=, Allg. Nat., or =Oken=, Allgem. Naturgesch.--Allgemeine Naturgeschichte für alle Stände. Von Professor OKEN. 7 vols. in 13. 8vo. Stuttgart, 1833–41.

=Oken=, Lehrb. Naturgesch.--OKEN’S Lehrbuch der Naturgeschichte. 4 vols. 8vo. Jena, 1815–16.

Oken’s Isis.--Isis von OKEN. 4to. Leipzig.

P. Ac. Philad.--Proceedings of the Academy of Natural Sciences of Philadelphia. 8vo. Philadelphia.

P. A. S. B.--Proceedings of the Asiatic Society of Bengal. 8vo. Calcutta.

=Pall.= Misc. Zool.--P. S. PALLAS: Miscellanea Zoologica. 4to. Hagæ Comitum, 1766.

=Pall.= Spic. Zool.--Spicilegia Zoologica. Cura P. S. PALLAS. 4to. Berolini, 1767–80.

=Pall.= Zoogr. Ross.-As.--Zoographia Rosso-Asiatica, sistens omnium Animalium in extenso Imperio Rossico. Auctore PETRO PALLAS. 3 vols. 4to. Petropoli, 1811.

=Penn.= Hist. of Quad.--History of Quadrupeds. By THOMAS PENNANT. 4to. London, 1781.

=Penn.= Syn. Mamm.--Synopsis of Quadrupeds. By THOMAS PENNANT. 8vo. Chester, 1771.

Penny Enc.--The Penny Cyclopædia of the Society for the Diffusion of Useful Knowledge. 4to. London.

=Petherick=, Travels in Centr. Afr.--Travels in Central Africa, and Explorations of the Western Nile Tributaries. By Mr. and Mrs. PETHERICK. 2 vols. 8vo. London, 1869.

=Pet.= Säug. Mossamb.--Naturwissenschaftliche Reise nach Mossambique. Von WILHELM C. H. PETERS. Zoologie. I. Säugethiere. Folio. Berlin, 1852.

Phil. Mag.--Philosophical Magazine. 8vo. London.

Phil. Trans.--Philosophical Transactions of the Royal Society of London. 4to. London.

=Pollok=, Sport in Brit. Burmah.--Sport in British Burmah, Assam, and the Cassyah and Jyntiah Hills. By Lieut.-Col. POLLOK. 2 vols. 8vo. London, 1879.

P. Bost. Soc. N. H.--Proceedings of the Boston Society of Natural History. VII. (1861).

P. U.S. Nat. Mus.--Proceedings of the United States National Museum, Washington. 8vo. Washington.