The _larynx_ is one of the organs which presents most manifestly the differences of sex. That of the female is usually one third, and sometimes one half smaller than that of the male: all its constituent cartilages are much thinner; the thyroid cartilage also is even flatter, because its two lateral halves unite at a less acute angle. Hence the reason why the larynx in the male forms at the upper part of the neck a prominence which is not visible in the female. The glottis in the female is much smaller than in the male, and the vocal cords are shorter. These sexual differences do not appear till puberty; until then the larynx has precisely the same form in the two sexes, and consequently the voice is nearly the same in both. In eunuchs it is small as in females. PHYSIOLOGICAL EXPLANATION OF THE BEAUTY OF FORM. A very ingenious Physiological explanation of the beauty of form, has been suggested by Professor B. T. Joslin, of the University of the city of New York, which is published in the Transactions of the New York State Medical Society for 1836. As this theory is characterized by great originality and genius, and but little known, we shall present our readers with some extracts from the Essay, calculated to elucidate the views of the talented author. Speaking of material objects, not including the human form, Dr. J. remarks:-- "There is in objects a kind of beauty which is intrinsic and physical, which belongs to them in every association, and whether at rest or in motion; such is the beauty of color, and that of configuration. The contemplation of the beauty of coloring and of form gives physical pleasure, i. e., physical as opposed to mental, but physiological as opposed to physical. Employing physical in its comprehensive sense, I say that this physical pleasure attending vision is of two distinct kinds; 1st, that which depends on the character of the impression on the retina, and consequently on the intensity and nature of the light; and 2dly, that which depends upon the form of the object, and, consequently, on the muscular actions employed in tracing its outlines. As the latter constitutes the proper subject of this essay, I shall dismiss the former with a single remark.