English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Tools annual

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Presents the access of premium content as premium feature

Premium Content

Global: Zendy Plus annual

Global: Zendy Free Plan

In a recent paper Osborne and Mendel [1912, 1] have described certain experiments which seem to show that young animals (rats) can grow when fed upon artificial diets consisting of " purified" constituents alone. These experiments would therefore indicate that the accessory factors of uncertain nature (complex lipoids or "vitamines" or "hormones ") which others have believed to be necessary are not, as a matter of fact, indispensable. Such experimental results must give pause to those who like ourselves are engaged in an endeavour to separate, and identify more closely, the accessory substances referred to. But they are results which contradict what is now a considerable body of experience, and the experiments which yielded them seem to call for repetition. These particular experiments were in a sense merely incidental to a wide enquiry, on the part of the authors quoted, into the nutritive efficiency of various proteins; and those which are of significance to the matter at issue (those, nanmely, which showed actual growth, and not maintenance alone) concerned only three animals [1912, 1, pp. 356, 358]. In a later paper [Osborne and Mendel, 1912, 2] the authors again refer incidentally to the subject and speak of having obtained " a considerable degree of success " by feeding in the absence of " the hypothetical organic hormones," etc. [1912, 2, p. 242]. But the weight-curves given in this paper show little more than maintenance of the animal, without growth; while, for some reason, the three experiments of the earlier paper which showed complete success in the promotion of vigorous growth are not further quoted. This success the authors attributed in the main to the fact that, in this dietary, salts were

A note concerning the Influence of Diets upon Growth