ERRATA. 



Vol. XXXVII. 



Page 394, line 13 from bottom,— -for " Stuart" read " Smart." 



Vol. XXXVIII. 



Eev. R. Harley, F.R.S., "Professor Malet's Classes of Invariants identified 

 with Sir James Cockle's Criticoids " : — 



Page 49, line 6— for " 1,, 0, Hi," read " 1, 0, H." 



Page 50, art. II, line 11,— -for " x " read " x\" viz., 



Q 3 =P 3 (^) 3 . 



Page 50, last line, and page 51, line 5— for " Q x " read " Q\ ." 

 Page 52, lines 9 and 10, — insert 



Page 53, art. 13, line 2 — for " P n " read " PJ,." 



Page 55, line 2, and page 56, line 2,— -for " + . . " read " Q u + . . " 



Professor Stokes, F.R.S., '* On a Remarkable Phenomenon of Crystalline Reflec 

 tion " :— 



Page 178, line 29— for " diffraction " read " refraction." 



