CORRECTIONS. 



Page 20. Last line, for lencites read leucites. 



,, 36. For elceolite read elceolite, and for Topax read Topaz. 



38. Foot-note (3), for 185 read 1865. 



,, 43. Line 27 for effects read effect. 



58 . Line 8 for < 2 > read W ; and line 32 for U> read < 2 >. 



,, 82. Line 23 for Sehreisheim read Schriesheim. 



,, 95. Line 9 for former read /<T and for / read former. 



114. Line 30 after p. insert 109. 



124. Line 27 for VI. read V. 



144. Line 14 for NaO read Na2Q. 



,, 156. Line 31 for Houghton read Haughton. 



,, 157. Line 28 for 111 read III, and line 30 for 111 readlll. 



,, 163. Line 31 for orthopinacoid read macropinacoid. 



,, 218. Line 4 for CW/?read Cawlyd. 



222. Line 41 for DAVIS read DAVIES< S >. 



,, 231. Line 45 for (Oil) read (110). 



,, 246. Line 9 for HAEDMANN read HAEDMAN. 



,, 270. Foot-note (2) for VALLEE-POUSSEN read VALLEE-POUSSIN. 



,, 272. Line 2 for to read of, and line 38 for TiO read Ti0 2 . 



,, 303. Line 2 for Ballygohen read Ballygihen ; line 4 for Roueval read Eoneval; line 

 23 for (7 a ) read difference between greatest and least refractive indices. 



Plate XIII. Fig. 1. The colour of the augite is a pale violet, not a brilliant pink as 

 represented. 



Plate XVI. Fig. 2. The fresh olivine substance in this rock is nearly colourless, not as 

 represented. 



Key Plate XL VII. for FIG. 4 read FIG. o and for FIG. 5 read FIG. 4. 



