I'KKSII>KNT S ADKKKSS. XV 



books wliicli !i student lU'cds. 1 most caniestly i-oinuiciifl nil 

 lovers of this study to aequin> a gardoi-pond. 



My own has not only furnished nie with a grand snpi)ly ni' 

 such tilings as Melicerta, Stephanoceros, several kinds of 

 Floscules, Stentors, Hydra, both firidis and vuhjaris. Amoebae, 

 innumerable infusoria and algfe, and some new or rare Desmids, 

 as noted by Mr. Wills, but has given me, in addition, a constant 

 supply of such rarities as (Kcistcs iiDihflln. yhliccrtrt annuhita 

 and Tnhicohind uaias, with Tardigrada and free rotifers, etc., in 

 abundance. In fact, I have only to complain of an e'vibarras dv 

 rirhesst's, and regret that want of time has prevented me doing 

 as much with them as I could have wished. 



Though the construction of a pond, or what in this case 

 may be better understood if called a fountain basin without the 

 fountain, is a simple matter, yet I know from experience that it 

 is by no means certain to be made successful at the first 

 attempt. Mine is a brick structure of about eight feet outside 

 diameter, and about two feet six inches m depth, measured from 

 the top edge to the base : the inside is made to slope at a good 

 angle, which is very important. It stands about eighteen niches 

 above the level of the surrounding ground, making nice sloping 

 banks for about half its circumference, the inside being 

 asphalted, which renders the whole perfectly water-tight. It has 

 an outlet and a temporary means of supplying water, but the 

 former is never required, and with the bountiful supply of rain 

 we have had during the past few years, it has rarely been 

 necessary to add any water whatever, occasionally just a little 

 to keep up tlie level during any warm and dry period we may 

 have happened to have, few of which have troubled us for a long 

 time past. 



The bottom and sides have a good layer of sandstone rubble 

 with a little clay, furnishing innumerable nooks and crevices, 

 where plants may root and animals may hide, no attempt what- 

 ever being made at architectural ornamentation. The rubble, 

 however, is carried to and over the edge of the brickwork, which 

 it completely hides, and is continued down the outside, making 



