Another reason for our attention to this test is that if it can be made to
show vitamine effect it provides an excellent medium for investigation of
vitamine "B" reactions, and a method for studying the effect of the
vitamine upon the protoplasm of a single cell.



CHAPTER V


THE SOURCES OF THE VITAMINE

Having now considered the general principles involved in vitamine testing
we may justly ask what information they have yielded us in regard to the
distribution of the vitamines in nature. If we must include vitamines in
our diets it is important to know how to select foods on this basis, hence
a classification of them on the ground of vitamine distribution becomes
essential. The newness of the subject and the limited tests that have been
made as well as the uncertainty residing in the test results make any
classifications presented more or less approximations but we present such
attempts as have been made, with the understanding that these tabulations
are merely guides and not quantitative measurements in the sense that
tables giving calorie values of protein, fat and carbohydrate content are.
The following table (1) has been freely copied from a report of the
British Medical Research Committee to which acknowledgment is hereby
given.


TABLE 1