The essentials of healthA text-book of anatomy, physiology, hygiene, alcohol, and narcotics . Fig. 69. The scapula and humerus in proper position to form the ball-and-socket joint of the shoulder. ened, yet it cannot be bent backward. The knee isanother example of this Fir;. 70. A section through the elbow joint: ir, the humerus ; u, theulna ; p, the process, which prevents the arm from moving back of a cer-tain line. Pivot Joints. The rotary motions of the head, bywhich the skull and the atlas turn upon the pivot of theaxis, furnish an illustration of a pivot joint. 12 178 THE ESSENTI
The essentials of healthA text-book of anatomy, physiology, hygiene, alcohol, and narcotics . Fig. 69. The scapula and humerus in proper position to form the ball-and-socket joint of the shoulder. ened, yet it cannot be bent backward. The knee isanother example of this Fir;. 70. A section through the elbow joint: ir, the humerus ; u, theulna ; p, the process, which prevents the arm from moving back of a cer-tain line. Pivot Joints. The rotary motions of the head, bywhich the skull and the atlas turn upon the pivot of theaxis, furnish an illustration of a pivot joint. 12 178 THE ESSENTIALS OF HEALTH. SUGGESTIONS TO TEACHERS. 1. The Marrow of Bone. Cut a transverse section of afresh bone ; the bone in a round steak answers well. Theoily matter, within the bone, is the marrow. 2. The Periosteum. Cut clown on any fresh bone andpeel off the membrane surrounding it. This is theperiosteum. 3. The Mineral Matter. Burn a bone in the stove. Theheat soon destroys the animal matter, leaving only themineral. A burned bone is easily broken and pulverizedwith a hammer. 4. The Animal Matter. Place one of the long bones ofa small animal, as the rib of a chicken, in a weak acidsolution, —nitric acid, one part; water, four or five a few days pour off the ac
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectphysiology, bookyear1
