As we have already said, the organization of the human body is composed of two parts: the development of the tissues and that of the constitution. The economy then cannot be said to be in a perfect state until this double development is finished, and the organs have gained all their power and substance. Unfortunately the labor of the constitution and its progress in activity and in receiving impressions, cannot be estimated by positive rules: but it is connected so intimately with the development of the body, that this can give a sufficiently exact idea of its progress and state. We may then simply by a glance at the development of texture, fix with a certain degree of precision, the value of these words: _premature_ and _precocious enjoyments_. It would be out of place to examine the different organs separately and trace their growth, and in the present state of science we cannot give this labor the precision necessary to attain our purpose. But there is one fact which can be measured, viz., the weight of the body. Let us state then the varieties in weight presented at different periods of life, as determined by Quetelet and Villermé. The mean weight of a male child at birth is three kilogrammes and twenty decimetres. Each year its weight increases in the following proportion: At 1 year he weighs 9 kil. 45 dec. 2 " " 11 34 3 " " 12 47 4 " " 14 23 5 " " 15 77 6 " " 17 74 7 " " 19 10 8 " " 20 76 9 " " 22 64 10 " " 24 52 11 " " 27 10 12 " " 29 82 13 " " 34 38 14 " " 38 76 15 " " 43 62 16 " " 49 67 17 " " 52 85 18 " " 57 85 19 " " 60 06 25 " " 62 93 30 " " 63 95 40 " " 63 67 50 " " 64 46 60 " " 61 94 70 " " 59 52 80 " " 57 83 90 " " 57 83 This table shows us that man attains the maximum of weight at forty years of age. At this age then we may regard the economy as being perfect. Now when we consider that persons from twelve to eighteen years indulge most frequently in masturbation and that this habit may be formed at a very young age, we may easily conceive of the ills with which it may be attended. This consequence is seen more clearly and exactly by the following table. The mean weight of man when the organization is complete being sixty-three kilogrammes sixty-seven decimetres, at the time of birth he has yet to gain sixty kilogrammes forty-seven decimetres.