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PART II.   CHAPTER IX. SILVER, GOLD, PLATINUM, CYANIDES, MERCURY. Silver—Detection 87     Dry assay 87         (1) Scorification 88         (2) Pot assays, average ores 90                 "             ores with metallic oxides 91                 "             ores with metallic sulphides 91     Explanatory notes on the fusion 93     The effect of charcoal, flour, &c. 94     The effect of nitre 95     The effect of mineral sulphides 95         (3) Cupellation 98             The loss of silver 101             Condition affecting the loss 102             Methods of correction 103             Lead required for cupellation 105         (4) Calculation of the results in ounces to the ton of 2240 lbs. Table 107             Ores with metallic particles 108         (5) Explanatory notes 110         (6) Examples of dry silver assays 113     Wet assays 116         Gravimetric method 117         Gay-Lussac's method 119         Volhard's method 121         A modified Gay-Lussac 123         Volhard's method applied to arsenic 124 Gold—Detection 126     Amalgamation assay 126     Dry assay 127         (1) Size of charges 127         (2) Sampling 127         (3) Assay tons 131         (4) Small buttons, weighing public@vhost@g@gutenberg@html@files@18751@[email protected]#Page_131" class="pginternal"