PHYSIOPHILOSOPHICAL SYSTEMS. 337 



who has classified the three kingdoms of nature upon 

 principles wholly his own ; who has perceived thousands 

 of homologies and analogies among organized beings 

 entirely overlooked before; who has published an exten- 

 sive treatise of natural history, containing a condensed 

 account of all that was known at the time of its publica- 

 tion; who has conducted, for twenty-five years, the most 

 extensive and most complete periodical review of the 

 natural sciences ever published, in which every discovery 

 made during a quarter of a century is faithfully recorded ; 

 the man who inspired every student who knew him with 

 an ardent love for science, and with admiration for his 

 teacher, that man will never be forgotten, nor can the 

 services he has rendered to science be overlooked so longr 



o 



as thinking is connected with investigation. 



CLASSIFICATION OF OKEN. 



The following diagram of Oken's classification is compiled from his All- 

 gemeine Naturgeschichte fur alle Stande ; Stuttgardt, 1833-1842, 14 vols. 

 Svo., vol. 1, p. 5. The changes this system has undergone may be ascer- 

 tained by comparing his Lehrbuch der Naturphilosophie ; Jena, 1809-1811, 

 3 vols. 8vo.; 2nd edit., Jena, 1831; 3rd edit., Zurich, 1843; Engl., Ray 

 Society, London, 1847, 1 vol. 8vo. Lehrbuch der Naturgeschichte; Leipzig, 

 1813; Weimar, 1815 and 1825, 8vo. Handbuch der Naturgeschichte zum 

 Gebrauch bei Vorlesuugen ; Niirnberg, 1816-1820, 8vo. Naturgeschichte 

 fiir Schulen ; Leipzig, 1820, 1 vol. 8vo.; and various papers in the Isis. 



1st Grade. INTESTINAL ANIMALS ; also called .Cody-animals and Touch- 

 animals. Only one cavity ; no head with a brain ; only the 

 lowest sense perfect ; intestines and skin organs, but no flesh ; 

 that is, no bones, muscles, or nervous marrow Invertebrata. 

 Characterized by the development of the vegetative systems 

 of organs, which are those of digestion, circulation, and re- 

 spiration. Hence 



Cycle I. Digestive Animals. = Radiata. Essential character : no deve- 

 lopment beyond an intestine. 



CL. 1. INFUSORIA (Stomach animals). Mouth with cilia only, to 

 vibrate. 



Z 



