Natural History of the Animalcules. 119 
only thrown new light upon the strufture and relations 
of the forms of life, but have even helped to revolutionise 
the conceptions of Life itself. The study of these organ- 
isms has been instrumental in dire6ling attention to the 
study of all minute forms; and humanity, in the fields of 
medicine and of commerce, is reaping, and will still more 
surely reap, the harvest of this research. 
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