Nut Oils have even less of the gluten, or gelatine, which give strength and desiccativeuess to linseed oil, and come nearer to the nature of animal oils, which never dry perfectly; resembling, in this respect, the fish oils of the seal and cod, which, after becoming dry, soften again and even flow, and acquire deeper colour than linseed oil: nevertheless the oils of nuts and poppy may be, and are, sometimes, boiled upon oxides of lead, in the manner of linseed oil, and with similar effect: in which state they may also be compounded with varnish in the formation of macgilp, and similar vehicles.