186 GLAUCUS ; OR, 
preof rested in this case was, that if the coralline 
were, as had often been thought, a zoophyte, the 
water would become corrupt, and poisonous to the 
life of the small animals in the same jar; and that 
its remaining fresh argued that the coralline had 
re-oxygenated it from time to time, and was there- 
fore a vegetable. 
In 1850, Mr. Robert Warrington communicated 
to the Chemical Society the results of a year’s 
experiments, “On the Adjustment of the Relations 
between the Animal and Vegetable Kingdoms, by 
which the Vital Functions of both are permanently 
maintained.” The law which his experiments veri- 
fied was the same as that on which Mr. Ward, in 
1842, founded his invaluable proposal for increasing 
the purity of the air in large towns, by planting 
trees and cultivating flowers in rooms, that the 
animal and vegetable respirations might counter- 
balance each other ; the animal’s blood being purified 
by the oxygen given off by the plants, the plants 
fed hy the carbonic acid breathed out by the 
animals. 
