x CONTENTS. 



Brook lime Water violet Speedwell Buck-bean 

 Flowers of ditto Aquatic Polygonum Water crowfoot 



Dimorphous leaves of ditto Water frog-bit Water 

 soldier Abundance of ditto in eastern counties Bladder- 

 wort Leaves of ditto Villarsia and Trapa Pond 

 weeds Star- worts Horn- wort Water milfoil Sweet 

 flag Bur-reed Beauty of aquatic gardens Page 71 



CHAPTER VII. 



MOLLLUSCA, INSECTS, ETC., OF THE FRESH-WATER 

 AQUARIUM 



Bryant's " Thanatopsis " Stock of aquaria Battles in ditto 



Mollusca of ditto Limnea stagnates L. auricularia 

 Habits of these two species Limnea pereger Planorbis 

 corneus Geological antiquity of fresh-water shells Plan- 

 dina vivipara .Habits of ditto Bythnia, Pisidium, and 

 Spharium Use of ditto in aquaria Swan mussel Unios 



Aquatic insects Life-histories of ditto Metamorphoses 

 of ditto Dragon-flies, larvae 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 Larvae of Ephemera 



Water spiders and ticks Nest of water spider Care 

 required in selection of aquatic insects, &c. 97 



CHAPTER VIII. 



THE AQUARIUM AS A NURSERY FOR THE MICROSCOPE. 



Interest of aquarium objects Microscopic life Desmids and 

 diatoms Unicellular character of ditto Hyalotheca, 

 Euastrum, Cosmarium, Closterium, and other desmids 

 Nature and habits of desmids Structure of desmids and 

 diatoms Frustules of diatoms Their siliceous character 



