92 



LECTURE VI. 



Formation of Tissue Of Epithelial and Fibrous Tis- 

 sue Formation of Spiral Fibres Contractile Tissue 

 Nerve Tissue Formation of Fibrous Tissue in 

 healing of a Wound Simple Fibrous Connective 

 Increase in Old Age and in Disease Mode of in- 

 crease in Muscles and Nerves No Fibrous Connec- 

 tive in Insects Skeletons of young Organs in the 

 Adult Interruption of Normal Changes Vitreous 

 Humour Mucous Tissue of Umbilical Cord Con- 

 nective Tissue White Fibrous Tissue Repair 

 Bioplasm of Cornea Bioplasm of Yellow Elastic* 

 Tissue Ligament of the Neck of the Giraffe. 



THE tissues of which the internal organs of animals 

 are composed vary remarkably in structure, compo- 

 sition, and properties. We find various gradations 

 of resistance and density, from a texture of such ex- 

 treme tenuity as to be scarcely demonstrable, to the 

 firm, fibrous, cartilaginous, and osseous tissues, the 

 hardness of which renders their investigation difficult. 

 All tissues are, however, formed from masses of bio- 

 plasm alike in general characters, though differing 

 vastly in power. 



133. Formation of Epithelial Tissue and Fibrous 

 Tissue. By many the formation of structures like 

 epithelium has been looked upon as a process distinct 

 from that which results in the production of fibres. 

 In classifying the tissues, attempts have been made 

 to show that those textures which were composed of 

 multitudes of " cells," were of a different nature to 

 those which exhibited a "fibrous appearance." More 

 careful investigation has proved that these ideas must 



