190 ZOOLOGY 



fluid may then pass by osmosis through the walls of the food 

 tube into the blood. 



(3) The organs of circulation : the tubes through which the 

 blood, bearing its organic foods and oxygen, reaches the tissues of 

 the body. 



(4) The organs of respiration : the organs in which the blood 

 receives oxygen and gives up carbon dioxide. 



(5) The organs of excretion : such as the kidneys and skin, which 

 pass off nitrogenous waste matter from the body. 



(6) The organs of locomotion : muscles and their attachments 

 and connectives, namely, tendons, ligaments, and bones. 



(7) The organs of nerv^ous control : the central nervous system, 

 which has control of coordinated movement. 



(8) The sense organs: such as sight, hearing, smell, taste, and 

 touch. 



Almost all animals have the functions mentioned above. In 

 most, the various organs mentioned are more or less developed, 

 although in the simpler forms of animal life some of the organs 

 mentioned above are either very poorly developed or entirely 

 lacking. 



Reference Rooks 



for the pupil 



Herrick, Text-hook in General Zoology, Chap. III. American Book Company. 

 Holder, Half Hours rvith the Lower Animals, Chap. I. American Book Company. 

 French, Animal Activities, Chaps. Ill, XI. Longmans, Green, and Company. 



FOR THE TEACHER 



Dodge, General Zoology, Chaps. VII-X. American Book Company. 

 Parker, Lessons in Elementary Biologij. The Macmillan Company. 

 Sedgwick and Wilson, General Biology. Henry Holt and Company. 

 Verworn, General Physiology. The Macmillan Company, 



