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mysterious problem, still to be solved by persevering micro- 
scopical observers. 
Although each of the little plants is, as I have already said, 
visible only to the practised eye without the aid of the lens, yet 
the water in which they are found is often tinged with green, in 
consequence of their vast numbers ; so you see that whether we 
look up into the heavens and inspect the bright revolving worlds 
above, or down into the waters, and there consider the little 
animated globes, we still find innumerable evidences of His 
handiwork.” 
Bibliography : Pritchard’s Infusoria (new edition) ; Micrographic 
Dictionary ; Carpenter’s “ Revelations of the Microscope Hicks’s con- 
tributions to the “ Microscopical Journal Williamson, Trans. Manchester 
Philosophical Society ; and other papers by Busk, Cohn, &c. 
