As pointed out in discussing the results for Squad A (see page 461, footnote 1), this increase in the percentage increment following work is in considerable part due to the lower basal value, although the absolute increments are not so regular as those found with Squad A. Here we have unquestionably the complicating circumstance of a diet furnishing but approximately one-third of the requisite number of calories, with severe drafts upon body material.

Considering the length of time required for the pulse-rate to return to normal, we find again wide differences among the men. Thus with Fis, and usually Ham, Sch, Tho, and Wil, most of the values are very low, while with Har, Kim, Lon, and Sne large values are the rule.

It so happens that of the men in squad B whose records appear in table 107, but three of them were taking the secretarial course, Kim, Sne, and Tho. Tho, after the first two days, had remarkably low values for the time required to return to normal. There is, however, little in this table which throws light upon the point raised by Pembrey in regard to the fitness for physical training and the facilitation of heart action, as indicated by the rapidity of return to normal pulse.

With normal diet the same individual with the same amount of work had approximately the same percentage increase. One must bear in mind the striking exceptions pointed out in an earlier paragraph, especially in the case of Ham, whose percentage increase ranged from 28 to 74 per cent, and of Tho whose increase varied from 50 to 107 per cent. In general the return to normal was reasonably uniform with a given individual. An inspection of these data shows no marked influence of the restricted diet upon the length of time required to return to normal, this not being markedly greater than with normal diet. It does happen, however, that a large number of the lowest values occur in the period of restricted diet and to this degree the results confirm the observations made with Squad A, in which the basal values with low diet obtained during January, when compared with those obtained during February with an unrestricted diet, showed a tendency for a more rapid return to normal of the pulse-rate following a definite amount of physical work.