ERRATA. 



Page 10 line 18 for essian . . . read Hessian. t/~" 



64 6 for 8 cwt. . . read 10 cwt. 



9210 from bottom, for are formed, read are found. 



103 16 for nitrate of abrontian . read nitrate of strontia. 



126 1 and 2, for 476/fo. and 37/fo. read 47 bolls, and 37 bolls. 



183 10 for (10 Si Oz+ KO. .) . read (10 Si O3 + KO.) 



251 3 for laclate acid . . read lactic acid. 



265 8 from bottom, for oxyen . read oxygen. 



