That plants play an unusually large role in the regions of Oceania, in connection with totemism as well as otherwise, is directly due to external conditions.
A grand and almost untrodden field of inquiry will be opened, on the causes and laws of variation, on correlation of growth, on the effects of use and disuse, on the direct action of external conditions, and so forth.
But, it is asked, what of the direct effect of external conditions, temperature, nutrition, climate and the like?
Its apparent prominence is explained by the circumstance that the influence of external conditions is easily made out, while inner conditions can be verified only through their effects.
Selection acts only by the accumulation of very slight or greater variations, caused by external conditions, or by the mere fact that in generation the child is not absolutely similar to its parent.
It is true that in this case the two forms no longer alternate regularly with each other, but the primary form may occasionally appear instead of the secondary form, owing to the action of external conditions.
Gulick in his paper on "Diversity of Evolution under one Set of External Conditions" (Journ.
I use the term "external conditions" now in the sense in which it is ordinarily employed: certain it is, that external conditions have a definite effect.
Variations in development induced by the influence of external conditions.
Cumulative Influence of External Conditions of Existence and Cumulative Counter-Influence of the Organism.
That the change is solely due to the particular stimulus can only be assured by strict maintenance of constancy of external conditions, during the period of experiment; this constancy can, in practice, be secured only for a short time.
The isolated specimen, generally speaking, attains a uniform sensibility after a few hours, which is maintained, with very slight decline under constant external conditions, for about 24 hours.
The variation may, however, prove its utility at once by a more exact correspondence than before with the requirements of external conditions.
Both the amoeba and we live in the closest relation to our environment, and conformity to it is evidently necessary: life has been defined as the adjustment of internal relations to external conditions.
But you will ask, What becomes of Mr. Darwin's theory of evolution, if obedience to the laws of individual being is more important than conformity to external conditions?
If, therefore, we attribute the forms of organisms to the action of {167} external conditions, i.
There are, then, abundant instances to prove that considerable {102} modifications may suddenly develop themselves, either due to external conditions or to obscure internal causes in the organisms which exhibit them.
Now, first, as regards Mr. Spencer's explanation of animal forms by means of the influence of external conditions, the following observations may be made.
The above list will hopefully provide you with a few useful examples demonstrating the appropriate usage of "external conditions" in a variety of sentences. We hope that you will now be able to make sentences using this group of words.
