Vlll CONTENTS OF VOL. I. FIFTH SERIES. 



Page 

 On the Effect of Thin Plates of Iron used as Armatures to 



Electromagnets, by J. Trowbridge 564 



On "Feldspar" and "Feldstone" versus "Felspar" and "Fel- 



stone " 567 



On the Displacement of the Lines in the Spectra of the Stars, 



produced by their Motion in Space, by Father Secchi .... 569 

 On a Simple and very Accurate Method of Tuning two Forks 



to Unison, by R. Spice 572 



PLATES. 



I. Illustrative of Mr. E. T. Newton's Paper on the Microscopic Charac- 

 ters of some peculiar forms of Coke. 

 II. Illustrative of Professors King and Rowney's Paper on the Serpenti- 

 nite of the Lizard. 



III. Illustrative of Dr. L. Bleekrode's Paper on Electromachines with 



Disks of Ebonite. 



IV. Illustrative of M. R. Pictet's Paper on the Application of the Me- 



chanical Theory of Heat to the Study of Volatile Liquids. 



ERRATA. 



Series 4, Volume 50. 



Pge 405, line 27, for T= 34-86-36 sec, read T= 34-836 sec. for the second 

 experiment of Kohlrausch, 



— 526, last line, for j^ZT read \Q n _ 7 



Series 5, Volume I. 



Page 348, line 10 from bottom, for diameter read thickness. 



— 349, line 9 from bottom, for active read inactive. 



— 370, line 4 from bottom, for ~j~ read — -r- 

 3 - M -^ read --^ 



