146 THE SUB-DIVISIONS OF BIOLOGY 



1835. Cell-division in plants observed by Mohl. 



1837. Caignard-Latour's demonstration that alcoholic 



fermentation is due to living organisms. 



1839. Schwann and Schleiden's ceil-theory. 



1840-1849. Joule's determination of the mechanical equiva- 

 lent of heat. 



1841. Faraday's discovery of electric induction. 



1846. Discovery of Neptune by Leverrier and Adams. 



Agassiz and Buckland's announcement of 

 extensive glaciation in Scotland. 



1848. Discovery of the antheridia of ferns by Suminsky. 



1849-1851. Hofmeister's comparative studies of the higher 

 cryptogams and the flowering plants. 



1809-1882. Charles Darwin. 

 1822-1895. Louis Pasteur. 



THE SUB-DIVISIONS OF BIOLOGY 



Morphology : 



Anatomy. 



Minute Anatomy. 



Comparative Anatomy. 

 Embryology. 



Physiology (including adaptations to the conditions of life). 

 Psychology of Animals. 

 Classification. 

 Geographical Distribution. 

 Palaeontology. 



All these divisions, except Psychology, apply both to plants 

 and animals. Many other modes of division have been 

 proposed. 



