(Continued from page 3 of Cover.) 



VOLUME 39. 



1. Richards, T. W., and Bonnet, F., Jr. — The Changeable Hydrolytic Equilibrium of Dis- 

 solved Chromic Sulphate, pp. 1-30. June, 1903. 35c. 

 1. LtmAN, T. — On the Prolongation of Spectral Lines, pp. 31-35. 1 pi. July, 1903. 10c. 



3. Ltmas, T. — An Explanation of the False Spectra from Diffraction Gratings, pp. 37-47. 



1 pi. July, 1903. 15c. 



4. Wood, R. W. — The Anomalous Dispersion, Absorption, and Surface Color of Nitroso-dimethyl- 



anilme. pp. 49-06. 3 pis. August, 1903. 35c. 



5. Greenman, J. M. — New and otherwise Noteworthy Angiosperms from Mexico and Central 



America, pp. 67-120. September, 1903. 50c. 



6. Davenport, C . B. — Comparison of Pecten opercularis from three localities of the British Isles. 



pp. 121-159. November, 1903. 75c. 



7. Notes. A. A., and Coolidge, W. D. — The Electrical Conductivity of Aqueous Solutions at 



High Temperatures. — I. Description of the Apparatus. Results with Sodium and Potas- 

 sium Chloride up to 306°. pp 1C1-219. November, 1903." 80c. 



8. Castle, W. E. — The Laws of Heredity of Galton and Mendel, and some Laws governing Race 



Lmprovement by Selection, pp. 221-242. November, 1903. 30c. 



