IX THE HISTORY AXD SCOPE OF ZOOLOGY 311 



to-day the great river of zoological doctrine to which 

 they have all been rendered contributory. Such a 

 subdivision of Zoology, whilst it enables us to trace the 

 history of thought, corresponds very closely with the 

 actual varieties of mental attitude exhibited at the 

 present day by the devotees of zoological study, 

 though it must be remembered that the gathering 

 together of all the separate currents by Darwin is 

 certain sooner or later to entail new developments and 

 branchings of the stream. 



We accordingly recognise the following five 

 branches of zoological study : — 



1. Morpliography. — The work of the collector 



and systematist : exemplified by Linnaeus and 

 his predecessors, by Cuvier, Agassiz, Haeckel. 



2. Bionomics. — The lore of the farmer, gardener. 



sportsman, fancier, and field-naturalist, in- 

 cluding Thremmatology, or the science of 

 breeding, and the allied Teleology, or science 

 of organic adaptations : exemplified by the 

 patriarch Jacob, the poet Virgil, Sprengel, 

 Kirby and Spence, Wallace and Darwin. 



3. Zoo-Dynamics, Zoo- Physics, Zoo- Chemistry, 



— The pursuit of the learned physician, — 

 Anatomy and Physiology : exemplified by 

 Harvey, Haller, Hunter, Johann Miiller and 

 the modern school of experimental physio- 

 logists. 



4. Plasmology. — The study of the ultimate cor- 



puscles of living matter, their structure, de- 

 velopment, and properties, by the aid of the 



