Page:The Book of the Aquarium and Water Cabinet.djvu/159

Rh only of joints and threads of a pale, but pleasing, green, grows rapidly, and gives out abundance of the vital phlogiston, about which aquarians are compelled to say so much.

The microscope at once increases a hundred fold the pleasure of instruction which the cabinet is capable of affording us. For the minuter forms of animal life, and for observing the circulation in the frog, or in vallisneria, &c., a good compound microscope is necessary. But for ordinary purposes, I should recommend a Coddington lens, or the pocket Aquarian lenses, sold by Mr. Cox, of 100, Newgate Street. They are made of three powers, fitting into a case, and may be used separately, or combined according to circumstances. The one here figured costs 7s. 6d., but a cheap common lens, fitted