10 MR. WAEINGTON'S 



the marine experiments ; and from it I shall make a 

 few extracts. 



" The sea-water with which the experiments were 

 conducted, was obtained through the medium of one 

 of the oyster-hoats at the Billingsgate fish-market, 

 and was taken from the middle of the English 

 Channel. 



" My first object was to ascertain the kind of sea- 

 weed best fitted, under ordinary circumstances, for 

 keeping the water clear and sweet, and in a sufficiently 

 oxygenated state to sustain animal life. And here 

 opinions were at variance, for one naturalist friend 

 whom I consulted, advised me to employ the Ehodo- 

 sperms ; another stated that it was impossible to make 

 the red weeds answer the purpose, as he had tried 

 them, and strongly recommended the olive or brown- 

 coloured Algse; while, again, others thought that I 

 should he more successful with those which had in 

 theory first suggested themselves to my own mind, 

 namely the Chlorosperms. After making numerous 

 unsuccessful experiments with both the brown and 

 the red varieties of Algae, I was fully convinced that 

 the green weeds were the best adapted for the purpose. 



" This point having been practically ascertained, 

 and some good pieces of the Enteromorpha and Ulva 

 latissima in a healthy state, attached to nodules of 

 flint or chalk, having been procured from the shore 

 near Broadstairs, several living animal subjects were 

 introduced, together with the periwinkle. Everthing 

 progressed satisfactorily, and these all continued in 

 a healthy and lively condition. 



"My first trials were conducted in one of the 



