FOOD. ' 19 



composed of coagulated albumin, and often not more than the ^T5tf f an 

 inch in thickness, found lining the blood vessels and lymphatics, forming 

 the basement membrane of the skin and mucous membranes, the posterior 

 layer of the cornea, the capsule of the crystalline lens, etc. 



III. Simple fibrous or filamentous tissue the elements of which 

 are real or apparent filaments. 



(a) Connective or areolar ; white fibrous tissue ; constituting tendons, 

 ligaments, aponeuroses, periosteum, dura mater, synovial membranes, 

 vascular tunics, etc. 



(b) Yellow elastic tissue ; found in the middle coats of arteries, veins, 

 lymphatics, ligamentum nuchoe, vocal cords, ligamenta subflava, etc. 



IV. Compound membranes (membrano- cellular or fibro-cellular 

 tissues), cells aggregated into laminse. 



(a) Epidermic tissue ; (b) epithelial tissue ; (c) glandular tissue; (d) 

 cornea. 



V. Cells containing coloring matter, or pigment cells, e. g., skin, 

 choroid membrane, etc. 



VI. Cells coalesced or consolidated by internal deposits, e. g., 

 hair, nails, bone, teeth, etc. 



VII. Cells imbedded in an intercellular substance, e. g., cartilage, 

 crystalline lens, etc. 



VIII. Cells aggregated in clusters, forming tissues more or less solid, 

 e. g., adipose tissue, lymphatic glands. 



IX. Cells imbedded in a matrix of capillaries, e. g., gray or vesicular 

 nervous matter. 



X. Cells whose coalesced cavities form tubes containing liquids or 

 secondary solid deposits, e. g., vascular tissue, dentine. 



XI. Cells free, isolated, or floating fluid tissue e. g., red and white 

 blood corpuscles, lymph and chyle corpuscles. 



FOOD. 



A Food may be defined to be any substance capable of playing a part 

 in the nutrition of the body. 



Food is required for the repair of the waste of the tissues consequent on 

 their functional activity, for the generation of heat and the evolution of force. 



Hunger and Thirst are sensations which indicate the necessity for 



