LOCALITIES OF INFUSORIA, ETC. 393 



gently and a portion only of the water expelled, the remainder 

 being poured into the bottle, and the process repeated as often 

 as necessary. Sporangia are collected more frequently by the 

 last than the preceding methods. When carried home, the 

 bottles will apparently contain only foul water; but if it 

 remain undisturbed for a few hours, the Desmidiese will sink 

 to the bottom, and most of the water may then be poured oiF. 

 If a little fresh water be added occasionally to replace what 

 bas been drawn off, and the bottle be exposed to the light of 

 the sun, the Desmidiese will remain unaltered for a long time. 

 I have now before me some specimens of Euastrum insigne, 

 the fronds of which are in as good condition as when I gathered 

 them at DolgeUy five months ago." 



Localities for Infusoria. — AU the smaller kinds are found in 

 vegetable infusions, or in fluids where either vegetable or 

 animal matter is decomposing, but the larger are only 

 to be met with in clear pools and streams, where they are 

 either found swimming about, or else congregated around, or 

 attached to the under surfaces of the leaves or to the stems 

 of aquatic plants. The ordinary ditches and ponds in the 

 neighbourhood of the metropolis will yield the more common 

 forms, but there are certain localities in which some of the 

 more highly organized can only be collected. A pond near 

 " Jack Straw's Castle," on Hampstead Heath, is very famous 

 for the Volvox globator, the Arborescent VorticeUa, and for 

 many species of Kotifer. According to Dr. ManteU,* in a 

 lake behind Grove House, on Clapham Common, in which the 

 white wate];-lily grows, the splendid Stephanoceros, or crowned 

 animalcule, was found by Mr. Hamlin Lee ; it has since been 

 met with in other ponds, but most abundantly in that called 

 the Black Sea, on Wandsworth Common, near the railway 

 station. A small pond in the garden of Mr. B. Edwards, in 

 Shoreditch, has been long noted as having suppUed micro- 

 scopists, at one time or other, with almost every variety of 

 the more highly organized Infusoria. 



The Alcyonella, and several species of fresh water sponge, 



* Thoughts on Animalcules, by G. A. Mantell, Esq., LL.D., London, 

 1846, page 63. 



