useless one, for whatever can help to prove the power and wisdom with which this world was created can not be time thrown away. To those who only use the microscope as an amusement (and it is a never-ending one), a short time occasionally is well bestowed on one of the most beautiful parts of the creation. There are upward of seven hundred species of Infusoria known and described. These are of all shapes and forms, some even assuming a variety in themselves; many possess eyes, others have none; some move so rapidly that the eye can not follow them, and others are attached to various substances; some have very many stomachs, or internal sacs, and others have only one; others, again, form a compound mass, that is, many individuals live in the same transparent case, and some are so minute, that by the aid of the best microscopes they can not be clearly discerned. Many people are disgusted after viewing water through a microscope, and suppose that all water abounds in living creatures, and that, consequently, we drink them in myriads. This is an error: there are none, or very few, in spring water, and, as no one would think of drinking from a ditch or stagnant pool where plants abound, there is little to fear. If necessitated to partake of water abounding in life, the person is either ignorant of its state, or the want is so urgent that the thought does not occur; and even should it arise, these delicate transparent little atoms would not be perceived by the taste--this fear or disgust may therefore be dismissed. Many waters abound in the larvæ of gnats and other insects, and minute creatures of the crustaceous order, but these can generally be seen by the naked eye.