The following notes record some of the features of interest seen by visitors to collieries, works, etc., which were, by kind permission of the owners, open for inspection during the course of the Newcastle-upon-Tyne meeting on September 16th, 17th, 18th and 19th, 1902:—

In producing white-lead by the old Dutch stack-process, the metallic lead is cast into thin plates and placed upon earthenware pots containing dilute acetic acid, which in turn rest upon a layer of spent oak-bark ; boards are placed above the lead, and other layers of bark, pots, lead and boards, are placed in the stacks until the stacks are full. After a period of about 3 months, the material is removed from the stacks, and a considerable proportion of the metallic lead is found to have been converted into hydrated carbonate of lead. This is crushed, washed, ground and dried, and then becomes the "genuine dry white-lead" of commerce. For painters' requirements, it is ground in refined linseed oil.