VOLUME 42. 



1. Robinson, B. L. — Studies in the Eupatorieae : (I.) Revision of the Genus P'querin ; (II.) 



Revision of the Genus Ophryospoms ; (III.) The Genus Helogyne and its Synonyms ; (IV.) 

 Diagnoses and Synonymy of Eupatorieae and of Certain Other Compositae which have been 

 Classed with them. pp. 1-48. May, 1906. 50c. 



2. Sabine, W. C. — Architectural Acoustics: (I.) Introduction; (II.) The Accuracy of Musical 



Taste in regard to Architectural Acoustics ; (III.) Variation in Reverberation with Varia- 

 tion in Pitch, pp. 49-84. June, 1906. 45c. 



3. Peirce, B. O. — On the Permeability and the Retentiveness of a Mass of Fine Iron Particles. 



pp. 85-91. June, 1906. 15c. 



4. Peirce, B. O. — On the Length of the Time of Contact in the Case of a Quick Tap on a Tele- 



graph Key. pp. 93-100. June, 1906. 15c. 



5. Mark, E L., and Copeland, M. — Some Stages in the Spermatogenesis of the Honey Bee. 



pp. 101-111. 1 pi. June, 1906. 20c. 



6. Hogg, J. L. — Friction and Force due to Transpiration as Dependent on Pressure in Gases. 



pp. 113-14(5. July, 190G. 45c. 



7. Peirce, B. O. — On the Conditions to be Satisfied if the Sums of the Corresponding Members 



of Two Pairs of Orthogonal Functions of Two Variables are to be Themselves Orthogonal, 

 pp. 147-157. July, 1906. 15c. 



8. Peirce, B. O. — On the Correction for the Effect of the Counter Electromotive Force induced 



in a Moving Coil Galvanometer when the Instrument is used Ballistically. pp. 159-1G9. 

 July, 1906. 15c. 



9. Feirce, B. O. — A Simple Device for Measuring the Deflections of a Mirror Galvanometer. 



pp. 171-174. 1 pi. July; 1906. 15c. 



10. Riddle, L. W. — Ou the Cytology of the Entomophthoraceae. pp. 175-197. 3 pis. August, 



1906. 40c. 



11. Baxter, G. P. — A Revision of the Atomic Weight of Bromine, pp. 199-214. August, 1906. 



25c. 



12. Larrabee, A. P. — The Optic Chiasma of Teleosts : A Study of Inheritance, pp. 215-231. 



October, 1906. 25c. 



13. Wood, R. W. — Fluorescence and Magnetic Rotation Spectra of Sodium Vapor, and their Analy- 



sis, pp. 233-260. 5 pis. November, 1906. 65c. 



14. Rotch, A. L. — Results of the Franco-American Expedition to Explore the Atmosphere in the 



Tropics, pp. 261-272. December, 1906. 20c. 



15. Kennelly, A. E. — An Approximate Law of Fatigue in the Speeds of Racing Animals. 



pp. 273-331. December, 1906. $1.15. 



16. Cole, L. J. — An Experimental Study of the Image-Forming Powers of Various Types of Eyes. 



pp. 333-417. January, 1907. $1.10. 



17. Smith, A. W. — Expansion and Compressibility of Ether and of Alcohol in the Neighborhood 



of their Boiling Points, pp. 419-460. January, 1907. 60c. 



18. Congdon, E. D. — The Hydroids of Bermuda, pp. 461-485. January, 1907. 40c. 



19. Blackman, M. W. — The Spermatogenesis of the Myriapods. (V.) On the Spermatocytes of 



Lithobiua. pp. 487-518. 2 pis. February, 1907. 50c. 



20. Moore, A. H. - Revision of the Genus Spilanthes. pp. 519-569. March, 1907. 60c. 



21. Richards, T. W., and Messrs. Henderson and Frevert. — Concerning the Adiabatic Deter- 



mination of the Heats of Combustion of Organic Substances, especially Sugar and Benzol, 

 pp. 571-593. March, 1907. 35c. 



22. Hall, E. H., and Messrs. Campbell, Serviss, and Churchill. — Ou the Thomson Effect and 



the Temperature Coefficient of Thermal Conductivity in Soft Iron between 115° and 204° C. 

 pp. 595-626. March, 1907. 40c. 



23. Mark, E. L.— An Electric Wax-Cutter for Use in Reconstructions, pp. 627-636. March, 1907. 



20c. 



24. Henderson, L. J. — Concerning Position Isomerism and Heats of Combustion, pp. 637-647. 



March, 1907. 20c. 



25. Lowell, P. — Temperature of Mars. A Determination of the Solar Heat Received, pp. 649- 



667. March, 1907. 25c. 

 20. Adams, J. M. — The Transmission of Rontgen Rays through Metallic Sheets, pp. 669-697. 

 April, 1907. 45c. 



27. Kennelly, A. E.— The Process of Building up the Voltage and Current in a Long Alternating- 



Current Circuit, pp. 699-715. May, 1907. 25c. 



28. Sanger, C. R., and Gibson, J. A. — The Determination of Small Amounts of Antimony by the 



Berzelius-Marsh Process, pp. 717-733. 1 pi. May, 1907. 30c. 



29. Records of Meetings ; Biographical Notices ; Officers and Committees ; List of Fellows and 



Foreign Honorary Members ; Statutes and Standing Votes, etc. 60c. 

 (Continued on page 2 of Cover.) 



