CONTENTS. XI 



How to prepare them for microscopical mounting 

 Beauty of diatom frustules Utilisation of ditto in the arts 



Various species of diatoms, Isthmia, Pinnularia, Pleuro- 

 sigma, Navicula, Stauroneis, Cocconeis, &c. Stalked 

 diatoms, as Licomophora Structure of latter The Amcebas 



Fresh-water sponges Structure of ditto Hydras 

 Their habits and development Rotifers Sessile rotifers 



Melicerta and Stephanoceros Their habits and structure 



Infusoria Vorticella, Epistylis, &c. Rotifer vulgaris 



Habits of ditto Fresh-water polyzoa Lophopus 

 crystallina, Plumatella repens, &c. Cyclops, its habits 

 and development Water fleas Relation of animalcules 

 to each other Page 113 



CHAPTER IX. 



MARINE AQUARIA FOR ROOMS. 



Difficulties attending private marine aquaria Construction of 

 ditto Rockwork for ditto Polygonal marine table tanks 



Sea-weeds for ditto Sea-lettuce (Ulvd) Cladophora 

 Oxygen-yielding qualities of certain sea-weeds Calli- 

 thamnion Green and red sea-weeds Delesseria and 

 Plocamium Cladophora, Bryopsis, Griffithsia, Ceramium, 

 Rhodymenia, Padina, Corallina officinalis, &c. Small 

 wrack " Irish moss " Fructification of sea-weeds Zoo- 

 spores of ditto Their use as food for lowly organised 

 animals Best time for introducing sea-weeds into aquaria 



Spontaneous appearance of sea-weeds in tanks of public 

 aquaria Oxygenation of sea water Artificial oxygen 

 Marine scavengers, as Haliotis, Patella, &c. Mr. W. R. 

 Hughes on construction of marine tanks Dark-chambered 

 slope-backed tanks Aeration of tanks Contrivances for 

 ditto Regulation of light and temperature of ditto 

 Evaporation of water Artificial sea-salts, their chemical 

 composition Mr. Gosse on ditto Specific gravity balls 

 and hydrometers Self-acting air-can for preserving aquatic 

 animals 1 39 



