(Continued from page 3 of cover.) 



VOLUME 58. 



1. Ames, A. Jb., Proctob, C. A., and Ames, Blanche. — ■ Vision and the Technique of Art. 



pp. 1-47. 28 pis. In press. 



2. Bibkhoff, George D. and Langeb, Rudolph E. — The Boundary Problems Associated 



with a System of Ordinary Linear Differential Equations of the First Order, pp. 49- 

 128. In press. 



3. Vatnio, Edwabd A. — Lichenes in Insula Trinidad a Professore R. Thaxter Collecti. 



pp. 129-147. January, 1923. $1.00. 



4. Bbtdgman, P. W. — The Effect of Pressure on the Electrical Resistance of Cobalt, Alumi- 



num, Nickel, Uranium, and Caesium, pp. 149-161. January, 1923. $.75. 



5. Bbidgman, P. W. — The Compressibility of Thirty Metals as a Function of Pressure and 



Temperature, pp. 163-242. January, 1923. $1.70. 



