298 



Presents. 



[Mar. 13, 



Although microscopically its form differs slightly when grown in 

 broth and the ammoniacal solution respectively, yet its identity whs 

 established beyond question by its returning to its characteristic 

 bacillo-coccus form when grown again in the ammoniacal solution. 



The authors have also been able to induce its tardy growth in 

 gelatine-peptone by passing it first through broth cultivations. 



The paper is accompanied by carefully executed drawings of the 

 nitrifying organism when grown in the various media employed. 



Presents, March 13, 1890. 



Transactions. 



Albany: — New York State Museum of Natural History. Reports. 

 1887-88. 8vo. Albany 1888-89. The Museum. 



Baltimore: — Johns Hopkins University. Studies from the Bio- 

 logical Laboratory. Vol. 1Y. No. 6. 8vo. Baltimore 1890; 

 Studies (Historical and Political Science). Eighth Series. 

 Nos. 1-2. 8vo. Baltimore 1890; Circulars. Vol. IX. No. 78. 

 4to. Baltimore 1890. The University. 



Basel : — Natnrforsohende Gesellschaft. Verhandlangen. Theil 

 VIII. Heft 3. 8vo. Basel 1890. The Society. 



Cambridge, Mass. : — Harvard College. Annual Reports. 1888-89. 

 8vo. Cambridge 1890. The College. 



Kew : — Royal Gardens. Bulletin of Miscellaneous Information. 

 Appendix I. 1890. 8vo. London. The Director. 



Kieff : — Societe des Naturalistes. Memoires. Tome X, Livr. 2. 

 8vo. Kiew 1889. [Russian.] The Society. 



London : — British Museum. Catalogue of the Fossil Reptilia and 

 Amphibia. Part 3. 8vo. London 1889 ; Guide to the Mineral 

 Gallery. 8vo. London 1889. The Trustees. 



Odontological Society of Great Britain. Transactions. Vol. 



XXII. No. 4. 8vo. London 1890. The Society. 



Photographic Society of Great Britain. Journal and Trans- 

 actions. Vol. XIV. No. 5. 8vo. London 1890. 



The Society. 



Society of Biblical Archaeology. Proceedings. Vol. XII. 

 Part 4. 8vo. London 1890. The Society. 



New York : — Loomis Laboratory of the Medical Department, of 

 the University of the City of New York. Researches. No. 1. 

 8vo. [New York] 1890. 



The Director, Laboratory of Physiology. 

 Siena : — R. Accademia dei Fisiocritici. Afcti. Ser. 4. Vol. I. 



Fasc. 10. 8vo. Siena 1889. The Academy. 



Switzerland: — Societe Helvetique des Sciences Naturelles, Actes. 



