Page:Popular Science December 1931.djvu/137

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(Continued from pane 132)

divided like black and while. That is where our poor Swiss rooster comes in, which was burned at the slake for laying an egg. You see, in birds, a small part of the male sex glands is potentially female. Normally, this part is inactive. But in certain cases, it develops abnormally, and egg-laying may be the result. You remember I told you that scientists have created this condition artificially. They did this by removing most of the sex glands, leaving the potentially female portion. The secondary male sex characteristics of these birds disappeared almost entirely — the rooster, for example, lost its comb and tail feathers. That was to be expected. The wonderful feature is that, in their new female form, the birds remained fertile. In other words, these were complete sex reversals.


 * Is a human being also potentially two-sexed?

the normal adult, only one sex is apparent. But, as I said, the dividing line is not as sharp as most of us think. There are many gradations between the 100 percent male and the 100 percent female. On the other hand, there are individuals, in the animal kingdom as well as among us, that are more than 100 percent male or female.
 * Only as an unborn baby. In

than 100 percent of anything?

female is meant the complete, normal male or female. In some individuals, however, the sex hormones are so powerful that they intensify the male or female secondary sex characteristics. In such cases, among people, you get the "'real he-man" type and the soft, over-feminine, "clinging vine" type of woman.
 * By 100 "percent male or

responsible for youth fulness?
 * .Are the sex hormones also

youthfulness or the vigor of youth — such things as physical prowess, activity, rapid rate of growth and repair of the body tissues, playfulness, and last but not least, the romantic tendencies of young people and their ability to have offspring — all are due to the activities of the sex hormones.
 * They are. What we call

simply the result of a slowing-up of the sex glands?
 * Docs this mean that old age is

In part, it is also due to the accumulation in the cells of the body of toxic, or poisonous materials, or waste products. Since these cannot be removed, they interfere with the normal working of the cells, much as the accumulation of dirt or dust interferes with the operation of any engine. After a while, the engine stops. So do the body cells. This is death from old age. Now, this matter of old age, or senescence, has been carefully studied by a number of investigators, among them the late Dr. Jacques Loeb, former director of the Rockefeller Institute; Professor Gary X. Calkins, of Columbia University, and Dr. Lurande L. Woodruff, of Yale. They found that the lowest forms of creatures that have the sex method can rejuvenate themselves.
 * Not entirely, but mostly.


 * How?

R. RUCKES: During most of their lives, these creatures, as I told you last month, reproduce themselves by self-division. When they got old — that is to say, when the one cell of which they consist becomes clogged with waste materials — they get sluggish and, unless they mate, they die. Such mating docs not produce offspring in the ordinary sense.


 * What does it do?

cells. The strange   (Continued on pane 134)
 * It rejuvenates the worn-out

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City State  DECEMBER, 1931