XXXII. Contributions from the Sheffield Laboratory of Yale Col- 

 lege.— IV. Observations on Caesium and Rubidium; by 

 Oscar D. Allen, Ph.D., 



XXXIII. Abstract of an investigation of the solar diurnal variation 

 and of the annual inequality of the Horizontal Component 

 of the Magnetic Force, from Observations made at the Gi- 

 rard College Observatory, between 1840 and 1845; by 



'a. D. Bache, LL.D., F.R.S., Sup't U. S. Coast Survey, - 



XXXIV. Abstract of the investigation of the influence of the 

 Moon, on the Horizontal Magnetic Force, from observations 

 made at the Girard College Observatory, in the years 1840- 

 1841-'42-'43-'44-'45; by A. D. Bache, LL.D., F.R.S., 

 Sup't U. S. Coast Survey, 



XXXV. On Arithmetical Relations between Chemical Equiva- 

 lents ; by M. Carey Lea, 



XXXVI. Description of Calamopor^, found in the gravel deposits 

 near Ann Arbor, Michigan, with some introductory remarks ; 

 by Carl Rominger, M.D., 



XXXVII. On a remarkable form of Rotation in the pith cells of 

 Saururuscernuus; by George C. Schaeffer, M.D., - 



XXXVIII. On the occurrence of Triphyline at Norwich, in Mas- 

 George J. Brush, 



lUic Spectra, Debray, 407. 



3 -Thallium, Crooki 



. Dawsox, 416.-Note oi 

 -Fifteenth Annua) Rpeort of the Regents of ttie Univer 



