Obtain specimens of pig-iron, cast iron, wrought iron, and cast steel; note carefully the fracture or "break" of each; how does cast iron differ from wrought iron?
Obtain specimens of the following copper ores: Malachite, azurite, chalcopyrite, and red oxide; wet a very small fragment with an acid and note the color when it is held in the flame of an alcohol lamp or a Bunsen burner; dissolve a crystal of blue vitriol (copper sulphate) in water and note what occurs if the end of a bright iron wire be dipped in the solution.
Name the various uses to which nickel, tin, lead, and aluminium are put.
Consult the chapters on these subjects in any cyclopædia.
TRANSPORTING SUGAR-CANE, CUBA
SUGAR-CANE GROWING IN CUBA
