[ 977 ] APPENDIX THE FIRST. A DESCRIPTION O F T H E POCKET-LAB ORATORIES FOR ' ASSAYING M INERALS, BY THE EDITOR; ; I ft. The Dry Laboratory. . t. <*pHE Pocket-Laboratories are fo called oil A account of their fize, which is abou,t that of an oCtavo book, for the convenience of car riage by traveling mineralogifts, either in the pocket, or in the portmanteau. They contain the chief implements and materials re quired for the immediate trial and examination of'foflil fubftances, whether recently obtained, or kept under erroneous denominations in va rious collections of Natural Hiftory; a circum- ftance that otten happens through the unfkil- fulnefs of the owners. t , R r r 2. The