AMERICAN ASSOCIA TION FOR THE AD VANCEMENT OF SCIENCE. 291 



Episcopal Academy. John W. Langley, of Ann Arbor, Mich., was chairman 

 and Henry Carmichael, of Brunswick, Maine, secretary. A list of the papers is 

 appended : 



On chloroproprionic acid and certain substituted acrylic and proprionic acids, 

 C. F. Mabery. Torsion balances, Alfred Springer. Anhydrobenzoamidosali- 

 cyclic acid, Charles W, Dabney. Continuous etherification, L. M. Norton and 

 C. O. Prescott. Analysis of a mural efflorescence, C. E. Monroe. The chemis- 

 try of roller milling, Cliflford Richardson. On the chemistry of fish, W. O. At- 

 water. Examination of methods proposed for rendering the ligher petroleum oils 

 inexplosive, C. E. Monroe. A new form of gas regulator, F. P. Dunnington. 

 Notes on Remsch's test, Henry Leffmann. Discussion on Valence, to be opened 

 by E. W. Clarke. Modification of Ruffles, method for the absolute determina- 

 tion of nitrogen, H. C. White. Optical method of estimating sugar in milk, H. 

 W. Wiley. A preliminary report on the composition of the coals of Kansas, E. 

 H. S. Bailey. Discussion — Educational methods in laboratory practice and in 

 the illustration of chemical lectures, opened by Ira Remsen. Fermentation with- 

 out combined nitrogen, Alfred Springer. On the assimilation of atmospheric 

 nitrogen by plants, W. O. Atwater. An explanation of Gladstone and Tribe's 

 *' 2 — 3 law in chemical dynamics," John W. Langley. Preliminary analysis of 

 the bark of Fouquieria splendens, Engel, Helen C. De S. Abbott. The density 

 of soHd carbonic acid, James Dewar. On a substitute for litmus, John Fred. 

 Heyes. Some observations on the phenomena of deliquescence, C. E. Monroe. 

 Methods of milk analysis, Albert N. Leeds. Simple lecture illustrations, F. P. 

 Dunnington. Production of argentic hydrate, F. P. Dunnington. Improvements 

 in apparatus for rapid gas analysis, Arthur H. Elliott. Anthrocene from water 

 gas tar, Arthur H. Elliott. 



Section D (Mechanical Science and Statistics) occupied Room 2, Horticul- 

 ural Hall, and with R. W. Thurston, of Hoboken, N. J., in the chair, and J. 

 Burkitt Webb, of Ithaca, at the secretary's table, turned its attention to the fol- 

 lowing : 



Steam engine practice in the United States, J. C. Hoadley. The strength of 

 cast-iron, W. J. Millar. Three problems of river physics, J. B. Johnson. Topo- 

 graphy of machines, Oberlin Smith. Driven wells, J. C. Hoadley. Training 

 for mechanical engineers, George J. Alden. Heating from a central source, 

 Frederick Bramwell. Giant's Causeway and Portrush Electric Railway, W. A, 

 Trail. On a new method of producing screws of standard length and uniform 

 pitch, William A. Rogers. The production of optical surfaces, John A. Brashear, 

 Irregularity in railroad building a chief cause of recent business depressions, 

 WiUiam Kent. Electric tramways, M. H. Smith. Economy of the electric 

 light, A. Stirling. Dillon's automatic sounder, Mr. Dillon. Dillon's flood regu- 

 lator, Mr. Dillon. 



Section E {Geology and Geography) held its sessions in the main Horticul- 

 tural Hall. N. H. Winchell, of Minneapolis, presided, Eugene A. Smith, of 



