Show DR WHITINGS LECTURE DELIVERED AT THE UNIVERSITY UNIVERSI-TY LAST EVENING The Mechanism of the Human Body His Theme Will Speak Again Nest Tuesday Evening Interest In the university public lecture lec-ture course still continues A large audience last evening heard Dr C A Whitings discourse on the Mechanism Mechan-ism of the Human Body The lecture was the first of a series of two to be given by Dr Whiting The second one is to be delivered next Tuesday night and is to be upon the subject How the I Body is Supported Regarding the mechanism of the human hu-man body the lecturer said in part The ossification of the skeleton is i hioi tonT what concerns us first tonight The skeleton as Is well known begins its I development in the form of cartilage Cartilages may be divided into two I classes permanent and temporary The permanent cartilage remains cartilaginous cartila-ginous during life while the temporary cartilage soonertor later becomes ossified ossi-fied or bony The permanent cartilage consists of three wellmarked varieties I varie-ties the hyoline cartilage and the I yellow elastic cartilage The hyoline cartilage closely resembles and perhaps I per-haps is just the same as the temporary cartilage I consists of cells separated I from each other by a secretion from i the cell known as the matrix of the cartilage The white fibrous cartilage I as are indicated by their name are fibrous in character consisting of I I threads running nearly or quite paral I lei with each other and differing in I the fact that the white cartilage is I I inelastic while the yellow cartilage is highly elastic These last two varieties I va-rieties of cartilages are found round i I the joints serving as ligaments binding bind-ing one bone to another Not alone do these cartilages bind the bones to one another but by forming pads between the bones they increase the pliability of the limbs Thus the knee joint Is a perfect sample of a hinge joint and so far as the bones are concerned the only motion permitted is a backward and forward motion Owing however to the cartilaginous pad between the bones a slight lateral motion is also permitted While most of the bones of the body begin as cartilages some as for instance in-stance those of the skull begin as membranes A membrane known as the periosteum which Is developed from the perlchon drium membrane envelops the carti lage The bony tissue begins not only in the cells of the cartilage but also In the perichodrium so that the bone isis is-is development ossifies from the center out as well as from the surface toward the center The lecturer then spoke of the fact that the bones are fully permeated by I blood vessels and nerves and explained 1 at some length the nature of these blood canals and nerve tissues In speaking of the fatty and spongy substance which fills the bone the professor pro-fessor told some interesting facts The yellow marrow he said which fills the tube of the bone serves as nutriment to the body of the bone while the red marrow which fills the cancellous space around the joints is the developing place of the red corpuscles cor-puscles of the blood The best skeletons which phislologists can get for study I are those o patients who have died of dropsy a disease during the course of which the yellow matter largely disappears dis-appears from the bones and being thus fed from fat are more easily bleached The professor then spoke In detail of the various ways in which bones are joined The lecturer had a large number of different kinds of bones on the platform with him and by means of these and with the help of blackboard black-board illustrations dispelled many of the erroneous ideas held by the popular popu-lar mind regarding the bony mechanisms mechan-isms of the human body I j The part the bones play In respira tlon next received the lecturers attention atten-tion Respiration he explained Is made possible by the peculiar structure struc-ture of the thorax The thorax ex tendingfrom the neck to the abdomen Is bounded on the sides by the ribs TheAIbsfr wjien the thorax is at Its smallest point downwards but by means of muscular action they may be brought to a position nearly at right angles with the spinal column thus enlarging the cavity of the thorax from the rear to the front At the same time that the ribs are brought forward for-ward the diaphram is forced down thus enlarging the thorax longitudinally longitudinal-ly As the walls of the thorax are rigid atmospheric pressure is unable to cause any compression and thus fill the vacuum formed by the enlarged thorax So air passes into the lungs through the mouth and nostrils and thus respiration Is carried on Speaking of the connective tissue which pervades every part of the body the bones as well as the fleshy part the professor said So thoroughly is the body permeated by these tissues that If all the other parts might be dissolved the connective tissue would retain the outline of the body not only that It would retain the outline of every organ in the body |