The number of investigations and investigators of vitamines seems to be increasing in geometric proportion, yet the sum total of our knowledge accumulates but little. The reason for this interest may be found in the unusual though well‐deserved concern aroused by the new light thrown on the all‐important problem of nutrition. Research has been stimulated as never before, and it is to be feared that workers have plunged ahead with great enthusiasm for the broader aspects of the subject and with but insufficient attention to the finer technical points. There is urgent need for more intensive and less extensive research if we are to arrive at a final understanding of the nature of the vitamines and their rôle in nutrition. A brief survey of the facts and a consideration of the present status of the subject may not be out of place.
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