4 A Manual of Veterinary Physiology. 



1. The plant forms organic substances ; the animal destroys 

 organic substances. The vital process in the plant is syn- 

 thetic, in the animal analytic. 



2. The life of the plant is a process of reduction ; the life 

 of the animal a process of oxidation. 



3. The plant uses up kinetic energy and produces poten- 

 tial energy : the animal uses up potential energy and pro- 

 duces kinetic energy. 



Passing now to the organic and inorganic compounds 

 found in the body, we find that the organic can be divided 

 into nitrogenous and non-nitrogenous. 



M'Kendrick* presents a table of the organic compounds 

 prepared on a physiological classification, which is here 

 reproduced. 



I.- Nitrogenous Bodies. 

 I. — Pkoteids. 



A. Tkue Albumins. 



1. Albumins — Serum albumin (blood), and egg albumin. 

 •_'. Globulins— Vitellin (yolk of egg), myosin (muscle), para- 

 globulin (blood), and fibrinogen (blood). 

 :'. Fibrin (blood-clot). 



4. Proteins — Casein (milk), alkali albumin, syntonin or acid 



albumin (muscle). 



5. Peptones — Albumin peptones, gelatin peptones (both diges- 



tive products). 



6. Crystallizable albuminoids. Haemoglobin (blood). 



7. Soluble ferments — Ptyalin (saliva), pepsin (gastric juice), 



pancreatin (pancreatic juice), tripsin (pancreatic juice), 

 inversive ferment (intestine), rennet (stomach of calf), 

 lactic ferment (iutestiuesi, fat splitting ferment (pancreas), 

 blood ferment. 



B. Albuminates. 

 1. Collagen (yielding gelatin;, chondrigen (yielding chondrin), 

 elastin (from elastic tissue), keratin (from horn and 

 epidermis), mucin (from mucus), and nuclein (nuclei of 

 -•ells . 



II. Fatty Nttkouenous Matters. 



1. Phosphoglyceric acid, nervous matter. 



2. Cholin or neurin, bile, etc. 



■ \. Lecithin, nervous tissue, blond corpuscles, yolk of egg, etc. 

 '.'>. Cerebrin, nervous tissues. 



• Texl book ot Physiol* in .' 



