Page:The chemical history of a candle.djvu/93

Rh if you will only make them with care and attention, and the assent of those around you. As we advance in Chemistry, we are obliged to deal with substances which are rather injurious, if in their wrong places—the acids, and heat, and combustible things we use, might do harm if carelessly employed. If you want to make hydrogen, you can make it easily from bits of zinc, and sulphuric or muriatic acid. Here is what in former times was called the "philosopher's candle." It is a little phial with a cork, and a tube or pipe passing through it. And I

am now putting a few little pieces of zinc into it. This little instrument I am going to apply