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Updated: May 2, 2025
Helmholtz's theory of vocal acoustics was fairly simple: The vocal cords vibrate after the manner of membranous reeds; a tone thus produced consists of a fundamental and a series of overtones; vowel and tone quality are determined by the influence of the resonance cavities, which reinforce certain of the overtones with special prominence. This theory is discarded by Prof. Scripture.
I dissected several specimens: the gizzard, which was very muscular, contained beetles, vegetable fibres, and pebbles. From this character, from the length of its legs, scratching feet, membranous covering to the nostrils, short and arched wings, this bird seems in a certain degree to connect the thrushes with the gallinaceous order.
Their feet are equipped with three webbed toes, while from the fore feet membranous wings, which are attached to their bodies just in front of the hind legs, protrude at an angle of 45 degrees toward the rear, ending in sharp points several feet above their bodies. I glanced at Perry as the thing passed me to inspect him. The old man was gazing at the horrid creature with wide astonished eyes.
Their fore wings were still membranous and delicately veined, and used in flying; they had not yet become thick, and useful only as wing covers, as in many of their descendants. FISHES still held to the Devonian types, with the exception that the strange ostracoderms now had perished.
The feet of some of these birds are partly webbed, so that, if necessary, they can change their mode of locomotion from running and wading to swimming. Birds whose feet are partly webbed are said to be semipalmated. This introduces us to that interesting group of birds whose toes are connected throughout their entire length by a thin, membranous web. Their feet are said to be palmated.
Another cause of too frequent nocturnal emissions and one wholly separate from any abuse of the sexual function is irritability and mechanical irritation of the sexual apparatus perhaps especially the membranous and prostatic portion of the urethra caused by the presence of an excessive amount of oxalates in the urine.
His face was beardless, lemon-coloured, and anxious-looking. It was disfigured by a number of longitudinal ruts, a quarter of an inch deep, the cavities of which seemed clogged with ancient dirt. The hair of his head was black and sparse. Instead of the twin membranous organs of Spadevil, he possessed but one; and this was in the centre of his brow.
From the hair-like processes on these tightly stretched fibers, auditory impulses appear to be transmitted to the brain. The tubes and chambers of the inner ear enclose and protect a delicate membranous sac of exactly the same shape as themselves. Between the bony walls of the passages and the membranous bag inside is a thin, clear fluid, the perilymph.
In response, one theory was advanced that this man had been in the habit of masturbating and had a stricture of the membranous portion of the urethra, associated with an ulcer of the prostate involving the ejaculatory ducts, or an inflammatory condition of all the tissues compressed by the ejaculatory muscles.
All substances, however, that appear to be in solution are not able to penetrate membranes, or take part in osmosis. *Kinds of Solutions in the Body.*—The substances in solution in the body liquids are of two general kinds known as colloids and crystalloids. The crystalloids are able to pass through membranous partitions, while the colloids are not.
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