Yeast cake and baking powders

63. Zinc, tin, and lead, in sheets; asbestos and tar paper, for roofing. It is understood that the packages or coverings in which the articles

named in the foregoing schedule are imported shall be free of duty if they are usual and proper for the purpose.

Schedule B.

Articles to be admitted at 50 per cent, réduction of the duty designated in the customs tariff now in force: