408 PRINCIPLES OF ANIMAL BIOLOGY 



Green Plant (EBF ISmin si). — ^Shows that living things are dependent 

 for food upon the green plant; the latter's processes of foodmaking and 

 growth are diagramed. 



Nitrogen Cycle (EBF 15min si). — Shows how nitrogen compounds 

 serve as a key to the transfer of energy in nature and how animals depend 

 upon plants for food. 



CHAPTER VIII. PHYSICAL SUPPORT AND MOVEMENT 



Body Framework (EBF 15min si). — Function of skeleton; structure, 

 chemical composition, growth and repair of bones; main types of joints. 



Muscles (EBF 15min si). — The structure and use of muscles are 

 presented. 



CHAPTER IX. SOURCES OF ENERGY AND MATERIALS 



Digestion (EBF 15min si).— Covers complete digestive tract. 



Digestion of Foods (EBF lOmin sd). — A summary of the digestive 

 process; show^s relation of circulatory and nervous systems to the diges- 

 tive process. 



Alimentary Tract (EBF llmin sd). — Treats in detail motihty phe- 

 nomena of the gastrointestinal tract by means of actual photography. 



CHAPTER X. RESPIRATION AND RELEASE OF ENERGY 



Breathing (EBF 15min si). — Explains action of diaphragm, breathing, 

 and lung structure and function. 



Mechanisms of Breathing (EBF lOmin sd). — The breathing mecha- 

 nism in operation. 



CHAPTER XL TRANSPORTATION SYSTEM 



Blood (EBF 12min si). — Illustrates the separation of plasma from 

 ]>l()()d cells, protein and salts from plasma, etc. 



Circulation (EBF ISmin si). — Traces circulatory system; ('omi)ares 

 liuman heart with that of the frog. 



Control of Small Blood Vessels (Lutz 2()min si). — Illustrates both the 

 sti-uctural and physiological features of the arterioles, precapillaries and 

 capillaries. 



Heart and Circulation (l^^^BF lOmin sd). — Detailed explanation of the 

 mechanics of the pulmonary and systemic systems. 



CHAPTER XII. DISPOSAL OF WASTES 



Work of the Kidney (l*]IU<' liinin sd). ^Detailed exposition of the 

 kidneys and their functions. 



