rrft 

 VNIVERSfTY 



... Of 

 OF THE BLOOD. 



f THE ^ 



'IRSfTY ) 

 Of / 



OF THE BLOOD. 



13. The Blood is fhe nutritive liquid of animals 



14. It is this liquid which maintains life in the organs, and 

 furnishes them with the materials of which they are composed. 



1/5. The blood is the source of all the humors formed in the 

 body ; as the saliva, tears, bile, &c. 



16. In man, anil all animals resembling him in organization, 

 the blood is red. In a great number of others, it is colourless, or 

 of a slight yellow or lilach tint. 



17. The animals which have red b/nnri, are the mammalia, 

 birds, reptiles, fishes, and certain worms called "Annelides." 



18. The animnls with white blood, are the insects, theArach- 

 nides. (that is spiders, and other animals resembling them,) the 

 Crustacea, (a class of animals composed of crabs, lobsters, &c.) 

 themollusea, (or animals resembling snails and oysters) and some 

 others. 



19. It is a vulgar error to suppose that flies have red blood in 

 the head : when one of these animals is crushed we see, it is true, 

 an effusion of reddfsh liquid, but this is not blood, and comes 

 from the eyes of these little beings, whose blood, like that of all 

 insects, is white. 



20. Blood is more or less thick and opaque. When examined 

 by a microscope we perceive that it is formed of two distinct 

 parts, namely : 



1st. Of a yellowish, transparent liquid, called Scrum. 



2nd Of a great number of solid particles of extremely small 

 size which swim in the serum, and which are called the globules 

 of the blood. 



21. To these globules the blood is indebted for its red color. 

 They are flattened and have a considerable resemblance to small 

 pieces of money slightly drilled out in the middle (page 30. Jig. 2.) 

 Their form and size vary in different animals. 



13. What is blood? 



14. What is the use of the blood ? 



15. What is the blood the source of? 



16. What is the color of the blood ? 



17. What animals have red blood ? 

 18 What animals have white blood ? 



19. Have flies red blood'.' 



20. Is the blood transparent? Of how many parts is it composed? What 

 are these parts called? What is serum? What are the globules of the 

 blood? 



21. Upon what does the red color of the blood depend? What is the form 

 of the globules? Are the size and form of the globules the same in all ani. 

 mals ? 



