252 THE MICROSCOPE. 



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

 pools formed by the sphagnum, on looking straight down 

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

 mass of jelly of a bright green, studded with numerous 

 brilliant bubbles of oxygen-gas. This is the general 

 appearance of most of the desmidacece, as Micrasterias, 

 Euastrum, Closterium, Cosmarium, &c. The spoon is also 

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

 will do nearly as well ; the ehief 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 nothing can be obtained in this 

 department of botany without going some distance from 

 town ; but assuredly only commoner and fewer species can 

 be met w T ith nearer home. At the West India Docks are 

 Synedra fasciculata, Gomphonema curvata, Diatoma elouga- 

 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 

 Cocconema lanceolatum, and other sjjecies of this genus, 

 Gomphonema cristatum, <fcc. 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 Chara vulgaris abound." 1 



On the north side of the Serpentine, Hyde Park, espe- 

 cially near the bridge, may be found : — 



Cocconeis placentula. 



Uvella hyalina. 

 Gallionella nummuloides. 



CymbeUa maculata. 

 Gomphonema cristatum. 

 Scenedesmus quadricauda. 



,, obliquus. 



Ankistrodesmus falcatus. 

 Pediastrum Heptactys. 

 Cocconema lanceolatum. 

 Amphora ovalis. 



Euastrum elegans. 



Pixidula operculata. 



Cladophora glomerata and Sphtero 



plea crispa, 'with, many other 



algae. 



(1) " Quarterly Journal of Microscopical Science." 



