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Larva of Stratiomys 125 Larvæ and Imago of Case Fly 128 Grating of Case Worm, Magnified 129 Dytiscus and Larva, Reduced 132 Hydrous Piceus 134 Colymbetes 135 Gyrinus Natator 137 Gyrinus, Magnified 138 Water Scorpion 142 Transformations of the Tadpole 144, 145 Pocket Lens 147

PREFACE.

Every day adds to the popularity of the Aquarium, but every day does not add to the accuracy of the published descriptions of it, or the perspicuity of the directions everywhere given for its formation and maintenance. Lately the periodical press has teemed with essays on the subject; but it does not require a very close scrutiny for the practical man to discern that a majority of such papers express the enthusiasm rather than the knowledge of their authors—a few weeks' management of a tank seeming to be considered a sufficient qualification for the expounding of its philosophy, though it demands an acquaintance with the minutest details of the most refined departments of botany and zoology to do anything like justice to it.

I have done my best to explain and illustrate the whole rationale of marine and fresh-water tanks in my lately published work, Rustic Adornments for Homes of Taste; but since that work, owing to the expense incurred in its production, is published at a price which every lover of the Aquarium cannot command, I have thought it no less a duty than a pleasure to treat the subject more briefly, but still practically, and I hope profitably, in a volume of less dimensions and less cost, written for another class of readers.

The object of this little work is to teach the beginner how to proceed safely and pleasurably in setting up aquaria, whether for mere ornament or for the study of the novel forms of animal and vegetable life which these collections enable us to observe closely, no less for the increase of our knowledge of the world, than for the exaltation of our sense of the omnipotence and benignity of Him who created it.

The Nursery, Tottenham.

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THE BOOK OF THE AQUARIUM.

THE FRESH WATER TANK.

CHAPTER I.

WHAT IS AN AQUARIUM?

The Name.—The term vivarium was first applied to the vessel containing a collection of specimens of aquatic life, and the first vivarium of such a kind, on anything like an extensive scale, was that opened to public exhibition in the Regent's Park Zoological Gardens. Many naturalists had previously made experiments to ascertain some certain method of preserving aquatic animals in a living and healthy state; and the vivarium, which is the result of those experiments, may be considered as an imitation of the means employed by nature herself in the preservation and perpetuation of the various forms of animal and vegetable life which people the oceans and the streams.

The vivarium is, therefore, no recent or sudden discovery, but a growth of years; and its present perfection is the fruit of many patient investigations, trials, disappointments, and determinations to achieve success.

The term vivarium applies to any collection of animals, to a park of deer, a rabbit warren, a menagerie, or even a travelling show containing an asthmatic lion, a seedy cockatoo, and a pair of snakes that are hourly stirred up with a long pole. Hence such a term could never convey the very special idea of a vessel containing such specimens as form the stock of the aquarium. When this was felt, the affix aqua was added, to convey the idea of the watery medium in which the specimens are immersed, and hence we had aqua-vivarium, a compound of too clumsy a character to remain long in use. It is the water that gives the collection its special character; and water always reminds us of old Aquarius, who treats us to an annual drenching from his celestial watering-pot. Aquarius triumphed, and the pretty prison in which his cool companions of the sign Pisces were doomed to be confined acquired his name; and, since it is better to follow than to oppose usage, we leave the philological part of the question to the learned, and adopt Aquarium as the name of our collection.

The Object of the Aquarium is to enable us to study the economy and derive pleasure from the contemplation of various forms of aquatic life, contributed by the lakes, the mountain rills, and the "resounding sea." Collections of objects that inhabit rivers and lakes are of course called Fresh-water aquaria; those that owe their origin to the sea are called Marine aquaria. A more simple name for the first would be River aquarium, which I humbly suggest it shall in future be called. But an aquarium is not a mere cabinet of specimens; it is a water garden in which we cultivate choice plants, and it is also in some sort a menagerie, in which we see living creatures of kinds hitherto the least studied by naturalists, displaying to our close gaze their natural forms, and colours, and instincts, and economy, as freely and as happily as if they were still hidden from us in their native depths. In this sense, the aquarium remunerates for any