(_b_) _Silver._—If in very much corroded condition, technically known as ‘dead,’ silver should be left alone. If there is only slight superficial corrosion, soak in a solution of common salt or lemon juice, or strong ammonia, and polish after a few hours. If there is a good deal of chloride on the surface, but the body of the metal seems sound, put zinc or iron in the solvent and the chlorine will pass over, leaving a powdery surface which can be brushed clean. Silver should never be packed in a tin box, even if wrapped up, or it will be found on arrival at home to be stained with a brown rust, very difficult to remove. Pack in wood or cardboard. (_c_) _Copper and Bronze._—Both copper and bronze objects are best cleaned, if possible, with hammer and burin. Bronze, however, which the traveller will meet with most often, is frequently covered with a corrosion which cannot be scaled off at once, and calls for an acid solvent. Diluted hydrochloric (1:10) will act most quickly and effectually, but it leaves a white oxy-chloride coat, not easily got rid of either from the metal or the fingers of the operator, which it stains deeply. On the whole, we recommend that (1) if the bronze be badly cracked it be left alone; (2) if not cracked, but covered with very hard corrosion, soaking in a weak solvent like lemon-juice be tried; and (3) after that (or before, if the corrosion will yield to a tool at all) every effort be made to pick or flake off the corrosion, after which the object should be rubbed well with oil in the palms of the hands. (_d_) _Lead and Iron_, after oiling, are both best left alone by the traveller. (_e_) _Stone._—The traveller will seldom or never be under the necessity to treat stone surfaces, except in the case of inscribed marbles on which carbonate of lime has formed, or small objects attacked by salt. The former can be cleaned with strong acid; the latter must be soaked in water for long periods, and when drying laid with the most important surface downwards, so that evaporation into the air may take place through the less important surfaces. (_f_) _Pottery and Terra-cotta._—The same enemies, carbonate of lime and salt, attack pottery and terra-cotta, and are met in the same way as in the case of stone; but the hydrochloric or other acid solvent should be weaker, and where there is colour be very cautiously used, if at all. In packing vases, it should be remembered that if many are put into one case without partitions, and one collapses, this will probably entail the breaking of the lot. Large vases should be filled with tightly rammed packing. Nothing of heavier or more solid material, _e.g._, stone, should be put in a case with pottery.