PHYSICAL CONSTRUCTION OP BLOOD. 213 



Mice, ......... 



Guinea pig, ........ 



Babbit, ......... 



Dog ....... ... T V-rV 



Cat, ......... A 



Birds, . ........ 



Frog, ' ......... 



Fish, ......... 



Only approximate estimates of the distribution of blood in the 

 body during life can be made, since there can be no accurate 

 method of investigation, and the amount varies enormously ac- 

 cording as the organ or part is in a state of rest or activity. It 

 is supposed that a quarter of the entire amount is habitually flow- 

 ing through the heart and great vessels, a quarter in the skeletal 

 muscles, another quarter in the liver, and in all the other parts 

 only a fourth. 



PHYSICAL CONSTRUCTION OF THE BLOOD. 



As already stated the blood is not a red fluid. It is seen with 

 the microscope to be made up of a clear fluid called plasma or 



Human Blood after death of the elements. The red corpuscles are seen 

 in different positions showing their shape, some also are seen in rolls. Only 

 one white cell (w) is seen, misshapen and entangled in fibrin threads. 



liquor sanguinis, which contains an immense number of little 

 disk-shaped bodies called red corpuscles, and a few colorless pro- 

 toplasmic cells, which are called white corpuscles ; so that the 

 living blood may be physically tabulated, giving approximately 

 an estimation of the relative amounts, thus : 



( Plasma or Liquor Sanguiuis 

 j Solid or Corpuscle 



