ANALYSIS OF THE LESSONS. Xxi 



the small intestines : Cat, Lion. 798. The intestinal glandular system. 799. 

 The solitary glands. 800. The same in the Lion. 801. Structure of the tongue 

 in Dogs. 802. Filiform and circumvallate papillae of the Dog. 803. Mucous 

 membrane of the stomach : Dog. 804. Separation of stomach from duodenum. 

 805. Duodenum of a Dog. 806. Jejunum and Ileum. 807. The colon. 808. 

 Certain accessory organs considered. 



LESSON LIU THE STRUCTURE OP THE TEETH, p. 188. 



809. Introduction. 810. Ultimate structure of the human gums considered. 

 811. THE TEETH. Sclerogenous tissue. 812. The tissues composing human 

 teeth, and those of the higher mammalia : the mode of their arrangement. 

 813. The structure of Enamel. 814. Its brittleness. 815. Its prismatic struc- 

 ture. 816. The method of separating the prisms described. 817. Connection 

 of the prisms to each other. 818. The facets of the prisms. 819. The same 

 demonstrated: their number. 820. The prisms separated. 821. Method by 

 which the dentinal tubuli (ivory) are connected to the enamel. 822. The junc- 

 tion of dentine with crusta petrosa. 



LESSON LIV. THE STRUCTURE OP THE TEETH, CONTINUED, .... p. 192. 



823. Probable formation of the prisms of enamel. 824. Appearance of the 

 dentine ; it forms a case in which the pulp is enclosed : aperture for the trans- 

 mission of vessels and nerves. 825. Description of dentine. 826. Direction 

 of the tubuli. 827. Illustration described. 828. The Crusta Petrosa described. 

 829. Its bone cells. 830. The canaliculi. 831. Ossification of the pulp cavity. 

 832. Examination of the tubular character of the dentinal canals. 833. A fur- 

 ther description of them. 



LESSON LV. THE STRUCTURE OF THE TEETH, CONTINUED, ^_. . . p. 194. 



834. Structure of the teeth in Dogs : molar tooth described. 835. The 

 molar of a Cat. 836. Canine tooth of a Horse. 837. Tusk of a Hog : longi- 

 tudinal section. 838. Transverse section of it. 839. Teeth of the Herbivorous 

 quadruped. 840. Peculiar arrangement of their tissues : necessity for it. 841. 

 This arrangement may be seen in the crown of a molar tooth. 842. Action of 

 flint upon teeth. 843. The systems of enamel hi the upper and under jaw. 

 844. Arrangement in the upper jaw demonstrated. 845. The tissues shown on 

 the same plane in a Sheep's molar tooth. 



LESSON LVI. THE STRUCTURE OP THE TEETH, CONTINUED, .... p. 198. 



846. Structure of the teeth in the Rodentia. 847. Effect of a broken tooth 

 of a Rat, or a Rabbit. 848. They are broken artificially for Museum purposes. 

 849. Structure seen in a longitudinal section of a Rabbit's incisor. 850. The 

 same in transverse section. 851. Structure of the molar teeth in the Rabbit. 

 852. Demonstration of it. 853. Molar of the Musk-rat : demonstration. 



LESSON LVII. THE STRUCTURE OP THE TEETH, CONCLUDED, .... p. 200. 

 854. The degradation of teeth : loss of tissue. 855. Structure of the teeth in 



