336 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 growth by inter-susception 
and by apposition is obviously only the necessary and direct 
result of the different conditions of density or state of 
agoregation in organisms 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 
