196 DETAILED SYNTHESIS. 



albumen changing into tissue ; but it must be allowed 

 that its rationale is not understood. 



223. THE SERUM OF THE BLOOD CONTAINS its albu- 

 men, calorific compounds, chemical compounds, and the 

 waste material of the tissues. 



224. PHYSICALLY, BLOOD MAY BE DIVIDED into cells, 

 fibrin, and serum. (Fat may also be mentioned.) 



225. LYMPH is a watery fluid, slightly tinged, re- 

 sembling the serum of the Blood in many respects, 

 though not of course so complex. It is sometimes called 

 the white Blood. It contains cells like the white ones 

 of the red Blood, and of various sizes, and which, as they 

 develop, become genuine red cells. 



226. FLESH-JUICE is a watery fluid like serum. 



227. SERUM is a fluid composed of water and a very 

 small portion of albumen, to produce glairiness. The 

 percentage of albumen varies in different cases, being 

 largest in the joints. 



228. Mucus is about one half water and the other 

 half albumen, producing a viscid liquid of a very slimy 

 and glairy character. 



229. FAT is, in man, properly speaking, an oil, as it 

 is liquid at the temperatures of the Body. It forms parts 

 of the Blood, and is deposited in cells in various parts of 

 the Body. It is a component of the Brain, and is poured 

 out on the surface of the Skin to protect it from harm. 



230. FAT is OBTAINED from the food directly, also 

 from the starch eaten, and perhaps also from sugar. It 

 abounds in meat, and exists also in many vegetables and 

 in the seeds of grain, being especially abundant in corn. 



231. Remark. THE OTHER FLUIDS OF THE BODY ARE ADAPTED to 

 special purposes, and can be better studied in connection with the par- 

 ticular organs to the use of which they are related. Several of the pre- 

 ceding also must again come under observation in describing the organs 

 with which their varieties are associated. 



228. What does -? 224. How ? 225. What ? 226. What -? 227. What 

 ? 228. What ? 229. What ? 280. How ? 281. To what ? 



