IV. WHAT IS MEANT BY "INDIVIDUAL." 



(See Haeckel, Ueber die Individualitiit des Thierkorpers, Jenaische Zeit- 

 schrift, Vol. 12, 1878; Lillie, Smallest Parts of Stentor Capable of Regenera- 

 tion, Jour. Morph. Vol. 12, 1896, pp. 239-249). 



1. Kinds of individuality. 



i. Physiological, the bion. 



ii. Morphological, the viorphoti. 



2. Degrees of individuality in morphons. 



i. Plastid. 



a. Cytode. 

 /;. Cell. 



ii. Idorgan. 



a. Organ. 



b. Paramere. 



c. Antimere. 



d. Metamere. 



iii. Person, or Zoon. 

 iv. Stock, or Cormus. 



3. Limits to the divisibility of the individual, Loeb, Mor- 



gan, Lillie. 



V. RELATIONS BETWEEN THE PARTS OF THE 



INDIVIDUAL. 



(See Owen, On the Archetype and Homologies of the Vertebrate Skeleton, 

 London, 1848, pp. 5-8; Gegenijaur, Comparative Anatomy, pp. 58-65; 

 Bateson, Materials for the Study of Variation, pp. 17-22, 87-90, 475-483.) 



Physiological similarity — Analogy. 

 Morphological similarity — Homology. 

 Arrangement of homologous parts. 

 Symmetry and merism. 



