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at universities, and a still more limited number of weighings of girls at colleges. But all these statistics piled together do not give us one comprehensive set of data including all ages. This is very much to be regretted, and it would be an important addition to our scientific knowledge could statistics of the growth of man be gathered with due precautions. It would fill one of the gaps in our knowledge which is lamentable. We have, however, some rough, imperfect data which for our present purposes it seems to me are adequate, and the results of the study of these will be shown by the next series of pictures.

But let us pause for a moment to consider this singular table. It shows in this column the number of days which it takes for each species