PLATES. 



I. & II. Illustrative of Mr. W. Barlow's Paper on Crystal Symmetry. 

 III. & IV. Illustrative of Prof. R. W. Wood and Mr. 0. E. Magnusson's- 

 Paper on the Anomalous Dispersion of Cyanin. 

 V. Illustrative of Dr. Morris W. Travers's Paper on the Liquefaction 

 of Hydrogen. 

 .VI. Illustrative of Dr. S. W. Richardson and Mr. Louis Lownds's Paper 

 on the Magnetic Properties of the Alloys of Cast-iron and Alu- 

 minium. 



ERRATA. 



P. 69, in the heading to the last column of Table III., 



, 320 3330 



tor t — -^r read t= — — 



P. 70, in the heading to the last column but one of Table IV., 



, 41-0 141-0 



tor t=s— ™- read t— — ^~ 

 r i 2 



P. 145, line 5 from bottom, for 6 read '6. 



P. 584, line 2 from bottom,/or (-4; -169) read(-±; -219). 



P. 587, line 4 from bottom,/©*- (^) 6 read (<^)o. 

 P. 587, line 2 from bottom, 



for tan -1 j =g + | | read tan -i { =| + | J . 



P. 588, lines 2 and 4 from top, /or f^l 6 read Lw. 



