Application of Student's ^-test shows the fall from the normal mean of 719 for the infusion method to the mean value of 489 of the aged group with low diastolic pressure to be highly significant (t ? 4-65 ; for n ? 26 and probability 0-05, t = 2-056)- In the case of the single injection series, however, where the normal young men have a mean CD of 535 and the aged men with low diastolic pressure have a mean CD of 419, the difference is not strictly significant (t ? 2-08 : for a probability of 0*05, /= 2-131).
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