252 



THE MICROSCOPE. 



little on either side of it, amongst the miniature Days and 

 pools formed by the sphagnum, on looking straight do'wn 

 into the water Ave shall probably see at the bottom a little 

 mass of jelly of a hriglit green, studded with numerous 

 brilliant bubbles of * oxygen-gas. This is the general 

 appearance of most of the desmidacece, as Mici-asterias^ 

 Euastrura, Closterium, Cosmarium, (fee. The spoon is also 

 a handy tool in this case, though, by practice, the linger 

 will do nearly as w^ell ; the chief difficulty arises when 

 the specimen is brought to the surface of the water, it not 

 being easy to get it out without losing a considerable por- 

 tion of it. Little pools in the bog, made by the footsteps 

 of cattle, are particularly good spots to find desmidiece, 

 many species being in a very contracted space. The most 

 prolific bog is at Tunbridge Wells, near a house known as 

 Fisher's Castle, not far from Hurst Wood. There is also a 

 good one at Esher, at a spot called West-End. It must 

 not be imagined that nothino- can be obtained in this 

 department of botany without going some distance from 

 town; but assuredly only commoner and fewer species can 

 be met with nearer home. At the West India Docks are 

 Synedra fascicidata, Gomplwnema curvata, Diatoma elovga- 

 tum, Diatoma vulgare, Surirella ovata, &c. ; and at this 

 same place a few objects, not of the botanical class, as 

 Spongilla Jluviatilis, Cordylophora lacustris, Alcyonella, 

 stagnorum, &c., are obtainable in abundance in the autumn. 

 In the ornamental water in St. James's Park may be found- 

 Gocconema laiiceolatum, and other species of this genus, 

 Gomplionema cristatiim, &c. Epping Forest, about the 

 neighbourhood of Leytonstone, Snaresbrook, Wanstead, 

 and Woodford Bridge, are also capital localities for the 

 filamentous algae, especially the last-named, where Nitella 

 translucens and Ghara vulgaris abound."^ 



On the north side of the Serpentine, Hj^de Park, espe- 

 cially near the bridge, may be found : — 



Cymbelia maculata. 

 Gomphoncina cristatum. 

 Scenedesmus qixadricauda. 



,, obliquiis. 



Ankistrodesmiis falcatus. 

 Pediastrum Heptactys. 

 Cocconema lanceolatum. 

 Amphora ovalis. 



Cocconeis placentula. 



Uvella hyalina. 



Gallionella nummuloides. 



Euastrinn ele^^ans. 



Pixidula operculata. 



Cladophora gloimrata and Sphaero- 



plea crispa, ■vvitli many othef 



algae. 



(1) "Quarterly Journal of Microscopical Science." 



