limit to the number which may be healthily maintained and exhibited. We have had the great advantage of having the following pages overlooked by Mr. W. A. Lloyd, of the Crystal Palace, to whom our best thanks are due for many valuable suggestions. The work is now presented to the public in the hope that it may add to the educational effects of our public aquaria, and be the means of rendering the education in zoology more popular and exten sive. IPSWICH, September 21, 1876. CONTENTS. CHAPTER I. THE HISTORY OF AQUARIA. - - Works of P. H. Gosse The Origin of Species'— Fish sup- - - Page I CHAPTER II. HISTORY OF AQUARIA-continued. Priestley's discovery of oxygen Trembley and his Hydras - aeration - Mr. Gosse's artificial sea-salts Hanover and tion Society Naturalists at British aquaria The Crystal Palace Aquarium - History and structure of ditto — Ditto of Brighton Aquarium Dr. Dohrn's aquarium at Naples Professor Agassiz's aquarium at Penekese Island - The Pleasures and educational influence of aquarium keeping Cruelty to animals Streamless aquaria Relation of animal to vegetable life — Balance of ditto - Parasitic fungi on aquarium animals Lloyd's contributions to literature of aquaria Over-stocking aquaria - How to proceed in stocking an aquarium — Bell-glasses and their uses- De- velopment of green algæ in aquaria How to arrest ditto How to keep down ditto - Temperature of ditto - Water in aquaria not to be changed Aquarium fountain Aquatic - Oblong tank for window Where materials can be purchased — Details of cheap aquarium ditto - How to remove decaying objects from ditto — How - Over-stocking aquaria -Yellow-spotted salamanders - Mexican Circulatory system of aerating large aquaria — Mr. Kent on - Flowers of ditto Aquatic Polygonum - Water crowfoot Dimorphous leaves of ditto - Water frog-bit - soldier Abundance of ditto in eastern counties Bladder- Mollusca of ditto - Limnea stagnalis — L. auricularia — Habits of these two species - Limnea pereger - Planorbis Geological antiquity of fresh-water shells dina vivipara - Habits of ditto - Bythnia, Pisidium, and Sphærium-Use of ditto in aquaria - Swan mussel - Unios · Aquatic insects — Life-histories of ditto — Metamorphoses of ditto Dragon-flies, larvæ of — Larva of Dyticus — Fero- cious character of ditto-Dyticus marginalis, male and female Habits of ditto - Great aquatic beetle (Hydro- philus); its habits - Wriggling beetles - Water bugs Water scorpions - Water boatmen - Various species of caddis-worms - Development of ditto — Larvæ of Ephemeræ |