50 Chemistry and Physics 



and fluorescence gives rise to several "reversals" or coincidences in position of 

 the narrowest fluorescence and absorption bands, whose significance is still open 

 to explanation. These "reversals" form a beautiful field for further investigation. 

 The distribution of energy in one group of bands and in the entire spectrum 

 has been measured with the aid of a specially adapted spectro-photometer. The 

 distribution resembles closely that of the energy distribution of a black body at 

 a much higher temperature. The luminescence of the fro/en solutions yields 

 spectra of the same type as the solid salt at room temperature. The nitrate 

 afforded the only striking exception, being resolved well at -185. 



The phosphorescence of the uranyl salts after photo-excitation was found to be 

 very rapid and of the so-called "vanishing" type, while the phosphorescence after 

 cathodo-excitation was of the "persistent" type. Studies of the two distinct types 

 led to the production of two new phosphoroscopes of precision, the synchronous 

 phosphoroscope and the vacuum phosphoroscope. 



Finally, the dependence of wave-length and grouping of bands on the water of 

 crystallization and crystal system were found to be very critical; in fact, this 

 dependence opens a new field with great possibilities. 



No. 198. MORSE, H. N. The Osmotic Pressure of Aqueous Solutions: Report on 



Investigations made in the Chemical Laboratory of the Johns Hopkins 

 University during the years /5po-/9/j. Octavo, 222 pages, 5 plates, 49 

 text figures. Published 1914. Price $2.00. 



This work gives an account of the investigations in osmotic pressure of Pro- 

 fessor Morse and his collaborators, Doctors Frazer and Holland. They extend 

 over the period 1899-1913, and were carried out in the chemical laboratory of the 

 Johns Hopkins University with the aid of grants from the Carnegie Institution. 

 Particular attention has been given to the development of the apparatus and 

 the methods by means of which, after eight years of experimentation, it was finally 

 made possible to measure osmotic pressure with a high degree of precision. The 

 following list of the headings of chapters will give an idea of the field covered: 



I. Cells and their Manometer Attachments. VIII. Cane Sugar. Final Determinations of 



II. Manometers. Osmotic Pressure. 



III. Regulation of Temperature. IX. Glucose. Final Determinations of Os- 



IV. Membranes. motic Pressure. 



V. Weight-Normal System for Solutions. X. Mannite. Determinations of Osmotic 



VI. Cane Sugar. Preliminary Determinations Pressure, 



of Osmotic Pressure. XI. Electrolytes. 



VII. Glucose. Preliminary Determinations of XII. Conclusion. 

 Osmotic Pressure. 



No. 29. BAIRD, J. W. The Color Sensitivity of the Peripheral Retina. Octavo, 80 

 pages. Published 1905. Price $0.50. 



This paper is the result of a physical investigation made by the author during 

 1903-4 in the Psychological Laboratory of Cornell University and is a contribution 

 to the knowledge of phenomena of indirect vision. The author presents data ob- 

 tained by him in a series of experiments upon the peripheral retina, and correlates 

 these data with the phenomena previously established and with the theoretical prin- 

 ciples advanced from time to time by other investigators. 



No. 57. WASHINGTON, H. S. The Roman Comagmatic Region. Octavo. For de- 

 scription see page 56. 



No. 88. BJERKNES, V., and Collaborators. Dynamic Meteorology and Hydrog- 

 raphy. Quarto. 



This work will constitute an advanced mathematico-physical treatise on the dy- 

 namics and thermodynamics of the atmosphere and the ocean, the main aim being 

 to develop rational methods, based on the principles of dynamics and thermody- 

 namics, for the investigations in meteorology and oceanography. 



PART I, STATICS by V. BJERKNES and J. W. SANDSTROM. Pages 146+la-36a, 



1&-30& and \c-22c. Published 1910. Price $5.50. (Out of print.) 

 This part deals with the conditions of equilibrium in atmosphere and hydro- 

 sphere, and contains a full development of the use which can be made of the 

 equation of hydrostatics for working out the results of observations obtained by 



