770 



SCIENCE. 



[N. S. Vol. IV. No. 100. 



1. On Certain Positive-Negative Laws in their Relation 

 to Organic Chemistry. A. Michael. 



2. The Jurassic Formation on the Atlantic Coast. O. 

 C. Maesh. 



3. The Hydrolysis of Acid Amides. lEA Remsen. 



4. 27je Isomeric Chlorides of Paranitroorthosulphoben- 

 zoic Acid. Iea Eemsen. 



5. The Equations of the Forces Acting in the Flotation 

 of Disks and Rings of 3Ietal, with Experiments showing 

 the Floating of Loaded Disks and Rings of Metal on 



Water and on other Liquids. Alfred M. Mayer. 



6. On the Geographical Distribution of Batrachia and 

 Reptilia in the Medicolunibian Region. E. D. Cope. 



7. On the Physical Causes of the Periodic Variations 

 of Latitude. S. Newcomb. 



8. On the Solar Motion as a Gauge of Stellar Distances. 

 S. Newcomb. 



9. Memoir of F. B. Meek. C. A. White. 



10. The Evolution and Phytogeny of Gastropod 3Iol- 

 lusca. A. E. Veeeill. 



11. On Flicker Photometers. O. N. Rood. 



12. A New Type of Telescope Free from Secondary 

 Color. C. S. Hastings. 



13. A Graphical Method of Logic. C. S. Peirce. 



14. Mathematical Infinity. C. S. Peiece. 



Prof. Willard Gibbs was requested to 

 prepare a biographical notice of the late 

 Prof. H. A. Newton, of Yale University, 

 and Prof. S. P. Langley, a notice of the 

 late Dr. G. Brown Goode. In addition to 

 the serious loss the Academy has suffered 

 in the deaths of Newton and Goode, three 

 of the twenty-two foreign associates have 

 died very recently, Hugo Gylden, August 

 Kekule and F. F. Tisserand. 



On the evening of Wednesday, November 

 18th, Mrs. Henry Draper gave a reception 

 to the Academy and invited guests. In the 

 laboratory at her house an exhibit was 

 arranged as follows : 



1. (a) Photograph of Delegates to the Kelvin Jubi- 

 lee, June, 1896 ; (h) Radiographs, Normal and Patho- 

 logical, taken by A. W. Goodspeed, Assistant Pro- 

 fessor of Physics, University of Pennsylvania. G. F. 

 Barker. 



2. Plates of Vital Statistics of the 28 Great Cities of 

 the United States. J. S. Billings. 



3. Stereoscopic Telescope and Binocular Dissecting 

 Microscope. H. P. Bowditch. 



4. Optical Glass. Relief Plates in Color. C. F. 

 Chandler. 



5. Photographs of the n&w Flying Machine. S. P. 

 Langley. 



6. VievFS of the Lias Formation in the United 

 States. O. C. Marsh. 



7. Small Model of Interferometer. A. A. Michel- 

 son. 



8. Photographs illustrating Recent Progress in the 

 Henry Draper Memorial. E. C. Pickering. 



9. Photographs showing the Effect of Pressure on 

 the Spectrum. H. A. Rowland. 



10. (a) Photographs and Transparencies ; (6) Re- 

 cent Geological Maps. C. D. Walcott. 



RECENT ADVANCES IN MALACOLOGY. 



During the past year some notable work 

 has been published, including not only con- 

 tributions to the natural history of groups, 

 anatomy, material for monographs, etc., 

 but also a certain number of studies which 

 lead to a change in the point of view of 

 whole series of evolutionary processes. As 

 these things are too late for the latest text- 

 books, and liable to be overlooked by 

 teachers who are not specialists, a brief 

 reference to some of the more important 

 may be useful. A remarkable series of in- 

 vestigations by F. Bernard, on the develop- 

 ment of hinge teeth in Lamellibranchs,* is 

 among the most striking in the results 

 which flow from the facts observed on the 

 nepionic stages in many genera. 



After the prodissoconch stage, when the 

 primitive pellicle secreted by the embryonic 

 shell gland is continuous between the 

 valves and the ligament is simply its uncal- 

 cified median part, come the nepionic stages 

 of which Bernard has recognized two types 

 among the species examined. One, which 

 is the most common, has the shell oval 

 with an arched dorsal hingeline and con- 

 vex umbones; the other has a straight 

 hingeline, a more elongated shell and the 

 umbones not projecting. To these might 

 have been added the fresh water glochidium 

 and lasidium, had species of Naiades or 

 MuteliB been among the forms studied. In 



*Bull. Soc. Geol. de France, 3me Ser. XXIII., 

 pp. 104-154, and XXIV., pp. 54-82, 412-449, 1896. 



