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ANDREWS. 



(c) Correlatively, the animal must develope along the lines of 

 contractile and irritable structures, while the plant developes 

 along lines of quiescent, assimilative, vegetative habit, and of 

 chemical reaction. 



(d) To the animal, surface is of less importance than the quali- 

 tative and quantitative structures developed within the mass. 

 Economy of surface with concentration of powers and function 

 will best serve it in the long run, in dealing with the evasive 

 conditions on which its existence is staked, 



(e) In the plant kingdom the substance is extended and or- 

 ganized in such a way as to secure for it as it rests passively 

 in its place the largest possible quantity of light, air, mois- 

 ture ; while its structures are so framed and grouped as to 

 retain and control these supplies. In its reproductive phenom- 

 ena, we see an approach to the more animal type of structure 

 and function, because the more kinetic element must, like an 

 animal, deal rather as contractile and irritable substance than 

 as assimilative substance with environmental conditions. 



(f) On the other hand in the animal kingdom we see often 

 in the female reproductive phenomena a plant-like phase in 

 which the assimilative and quiescent, or vegetative, state pre- 

 dominates. 



(g) In plants there seems to be chiefly a quantitative exten- 

 sion of function during growth and development. In animals 

 while the powers advance along paths of both quantitative and 

 qualitative emphasis during growth of the individual, the quali- 

 tative emphasis is usually most notable. 



(h) In both kingdoms the full set of intrinsic powers of the 

 substance seems to be alike and to be in great measure retained ; 

 but their habitual expression differs in the two. Just as in the 

 animal there are purely vegetative and assimilative areas, so in 

 the plant there are markedly contractile, and in most, irritable 

 states also, of the protoplasm. Indeed, in each cell area of both 

 animal and plant these truths are characteristically repeated. 



(i) The extension of the animal's control over external con- 

 ditions by means of its intensification areas will be discussed 

 in full both as to means and manner, in my forthcoming 

 paper. 



