ERRATA. 



Vol. VIII. — Page 225, line 19, (from top,) for seconiary read transition. 



" 228, *' 28&29, " s^iier Porcelain Clay and rose- 



red Quarts, for at do. read at Bristol. 



" 230, The Carbonate of Iron, Ameihyst, Quartz, and Idocrase. 

 should be credited to Messrs. S. Taylor and T. 

 H. Webb. 



" 396, line 9, (from top,) for truncations read terminations. 

 Tol. IX. — '* 2, " 2, (from bottom,) for by-valves read bivalves. 



" 6, " 5, " for emerge read converge. 



" 8, " 16, (from top,) for there read then. 



" 10, " 2, " after metal dele , 



" 15, "5, ," for flattened redid scattered. 



" 15, " 6, (from bottom,) for Di'sdown read Dzorforws, 



" 25, " 10, (from top,) for arte he read are the 



•' 80, "5&8 " for experiment re&d experiments. 



<i 82, " 32 " for Mager read Wager. 



" 95, "1,5,&19, " for A read L. 



" 97, " 7, (from bottom,) dele in a great measure. 



" 101, '* 2, " for ginSraikes read generatrices. 



" 329, "12, (from top,) for S.F.Dana read J. F. Dana. 

 In No. II. of this Vol. Articles X and XI, and also those succeeding; XIV, 

 are incorrectly numbered ; they may be corrected by referring to the cover. 



In No. I. Plate IV, Fig. 6. — In the delineation of the balance beam^ 

 the weight D is entirely left out ; it should have been suspended at the bottom, 

 of the slide E, or what is preferable, a small scale-pan should be suspended 

 there, in which the counterbalancing weights may fee placed, without disturb- 

 ing the adjustment. , 



