XX INTRODUCTION. 



founder, Bichat, himself has done it, by the following 

 comparison. Chemistry has its simple bodies, as heat, 

 light, hydrogen, oxygen, nitrogen, carbon, and so on, 

 whose several combinations form all the composite bo- 

 dies on the face of the globe. In the same way anatomy 

 has its simple tissues, whose varied combinations form- 

 all the organs of the human body and of animals. 

 These tissues are,* 



1. The Cellular, Vol. I. p. 317 



2. The Adipose, or Medullary, 325 



3. Vascular, II. p. 153, 280 



4. Nervous, 313 



5. Osseous, I. p. 56 



6. Fibrous, or Desmoid, - 257 



7. Cartilaginous, 351 



8. The Fibro-Cartilaginous, 256 



9. Muscular, - 351 



10. Erectile, or Spongy, as Penis, &c. II. p. 85 



11. Mucous, 50 



12. Serous, 10 



13. Dermoid, or Skin, I. p. 328 



14. Glandular, as Liver, Kidneys, &c. &c. II. p. 56 



The distinctions of tissue do not rest upon an imagi- 

 nary basis, but have nature for their foundation. The 

 organization of each has well marked, and characteristic 



* Bichat admits twenty-one elementary tissues, but several of them 

 are but modifications of one and the same. For example, the arterial, 

 the venous, and the absorbent, belong all to the vascular, and I have 

 thought it useful to concentrate them under one head; and so of some 

 others, where the analogy is equally evident. As the nature of the 

 work did not admit of the consecutive description of these tissues, re- 

 ference is made to the pages in which they are discussed. With this 

 guide they may be studied in immediate succession, by the person 

 desirous of an outline of General Anatomy. 



