The problem of determining the optimum quantity of protein necessary for the growing organism has been the subject of numerous observations. The result of feeding to an infant large quantities of protein over a prolonged period has not been studied to the extent it deserves and it was with a desire of increasing our knowledge on this subject that the work detailed in this paper was carried out.
It has been shown many times that the growing organism requires a certain quantity of protein for the replacement of tissues due to "wear and tear" as well as for growth of body, true growth being intimately associated with the retention and fixing of nitrogen compounds as integral parts of the body. No doubt the amount of protein required varies from time to time in accordance with what Mendel1 has been pleased to call the "growth impulse." However variable may be