33^ THE HISTORY OF CREATION. 



aggregation, the newly-added particles penetrate into the 

 interior of the organism (inter-susception), whereas anor- 

 gana receive homogeneous matter from without only by 

 apposition or an addition of new particles to the surface. 

 This important difference of gi^owth by inter-susception 

 and by apposition is obviously only the necessary and direct 

 result of the different conditions of density or state of 

 ao^o^reo^ation in oro^anisms and anorgana. 



Unfortunately I cannot here follow in detail the various 

 exceedingly interesting parallels and analogies which occur 

 between the formation of the most perfect anorgana, the 

 crystals, and the formation of the simplest organisms, the 

 Monera and their next kindred forms. For this I must 

 refer to a minute comparison of organisms and anorgana, 

 which I have carried out in the fifth chapter of my General 

 Morphology (Gen. Morph. i. 111-160). I have there 

 shown in detail that there exist no complete differences 

 between organic and inorganic natural bodies, neither in 

 respect to form and structure, nor in respect to matter and 

 force ; and that the actually existing differences are dependent 

 upon the peculiar nature of the carbon; and that there 

 exists no insurmountable chasm between organic and 

 inorganic nature. We can perceive this most important 

 fact very clearly if we examine and compare the origin of 

 the forms in crystals and in the simplest organic individuals. 

 In the formation of crystal individuals, two different counter- 

 acting formative tendencies come into operation. The inner 

 constructive force, or the inner formative tendency, which 

 corresponds to the Heredity of organisms, in the case of the 

 crystal is the direct result of its material constitution or of 

 its chemical composition. The form of the crystal, so far as 



