SYSTEMATIC ANALYSIS OF ORGANS. 133 



its differences of texture in different cases, but by the 

 differences in its quantity, and in the form and other pe- 

 culiarities of Organs ; which must be noticed when each 

 organ is considered in detail. 



500. Illus. THE HEART AND STOMACH ARE COM- 

 POSED of four of the same kinds of Tissue. Both organs 

 require a framework of sinewy tissue formed into pouch- 

 es, but the size and form of the organs must differ. 

 The sinewy tissue must in both cases be wrought so 

 as to leave meshes, but in a different order, to receive 

 muscular tissue that must be differently arranged to pro- 

 duce different kinds of motion in the two cases. Ner- 

 vous tissue must be inserted in each according to the 

 muscular arrangement. The outer surface of each must 

 be formed of the same variety of secretory (the serous) 

 tissue to produce the same variety of fluid for the 

 purpose of preventing friction; but while the Heart 

 should be lined with the same variety of secretory (se- 

 rous) tissue, the Stomach must be lined with a variety 

 that will secrete a more viscid fluid, and the Stomach 

 must also be furnished a variety to secrete the gastric 

 juice. They are therefore very much alike, and yet 

 very distinctly different. The Heart and Diaphragm 

 are just alike in tissural constitution, and only differ in 

 size, form, and position ; the Diaphragm being the Heart 

 spread out, and the Heart being the Diaphragm in the 

 form of a pouch. 



501. SYSTEM is the name given to all of any kind of 

 Tissue in a living thing arranged as it naturally exists. 



502. Inf. There are as many systems in the Body 

 as there are Tissues. 



(Bony I 

 Gristly 

 Nervous \ S y stems ' 

 Muscular 

 Secretory J 



503. SYSTEM is ALSO USED, though not with perfect 

 propriety, for naming the whole of any kind of parts 

 of similar structure. 



500. Illustrate how ? The heart and diaphragm. 501. What is ? 502 Write 

 and explain table of . 503. How ? 



