HISTOLOGY 



MICROSCOPICAL ANATOMY OF THE HUMAN BODY 



PART I. 



HISTOLOGY. 



MICROSCOPICAL ANATOMY OF CELLS AND 



TISSUES. 



HISTOLOGY is the study of tissues (6 tcrrog, TO lanov, tissue). 

 It must therefore primarily treat of the cell as a tissue-element; 

 then concern itself with the description of vegetable and animal 

 tissues; and finally discuss the relations which the tissues bear 

 to one another in all the organs. This last part of histology is 

 also spoken of as microscopical anatomy. 



Our text-book, which concerns itself only with the histology 

 of man and the animal body, is divided into two parts: the 

 first will treat of the animal cell and tissues; the second will 

 make the reader acquainted with the microscopical structure of 

 the organs. 



Histology takes a prominent part among the biological 

 sciences which have developed so greatly since the discovery 

 of the cell in the year 1838. As early as the end of the 

 seventeenth century there were more or less definitely ex- 

 pressed premonitions and suspicions that cells formed the 

 elementary constituents of plants. Only in the year 1838, 

 however, did the opinion that plants consist of cells gain general 

 recognition after the publication of M. Schleiden. In the 



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