THE PLAN- ON WHICH MAN'S BODY IS BUILT. 5 



to bind parts together. Bony 

 tissue is stiff and useful to sup- 

 port softer parts. Cartilage tis- 

 sue is elastic and forms admir- 

 able springy cushions between 

 the hard bones. Muscle tissue 

 has power to move parts to which 

 it is joined; and so on. 



In addition to the solid tissues, 

 liquids form part of the body: 

 as the blood which we see flow 

 from a cut finger, and the saliva 

 which moistens the mouth. 



8. The General Plan on which 

 the Body is Built. If a man's 

 body were sawed in two down 

 the middle, so as to separate 

 it into right and left halves, we 

 should see something like Fig. i, 

 if we looked at the cut surface 

 of the right half. On examining 

 the figure you see that there are Fig. i. A section along the mid- 



die of head, neck, and trunk. 6 t 



tWO Chief Cavities Or chambers the chest, and c, the abdominal 



division of the ventral cavity sep- 



in the body, having between them arated by the diaphragm, d. ', 



the enlarged upper end of the dor- 



the row of bones , e; these bones -}, 

 together form the back-bone or 

 spine. The chamber, B, C, in 



f f ,1 i * i . , the nose. o. the mouth. /, the 



front Of the back-bone IS much lungs; the tube leading down to 

 Al . . . , . them is the windpipe. A, the 



the larger; it is named the ve/i- heart. /, the stomach; the tube 



leading down to it is the gullet; 

 tral cavity. 1 he Other Chamber, the tube passing from the stomach 



to the lower end of the trunk is the 

 a, a' is the dorsal Cavity. intestine. , a kidney. *, the 



sympathetic nervous system. 



8. How does the plan on which a watch is made compare with that 

 on which the body is constructed ? In a human body cut down the 

 middle what chief divisions would you find ? 



