INTRODUCTION. 7 



Among those who have specially distinguished themselves in connection 

 with this subject, we may mention the names of Mulder, Danders, C. 

 Schmidt^ Lehmann, Schlossberger, Hoppe, and Kuhne. Schlossberger is 

 the author of the first hand-book on histochemistry which scientific litera- 

 ture can produce. 



6. 



In conclusion, we have only to give a brief sketch of the plan we shall 

 pursue in the following pages. Histology and histochemistry combined, 

 or the study of the finer structure and chemical composition of parts, con- 

 stitutes the most important foundation for physiology and scientific path- 

 ology. The whole subject may be arranged, according to our views, into 

 three great natural divisions. 



In the first will be considered the matters of which the human and 

 animal body generally is composed, with their histological and (as far as 

 inseparable from these, and that a knowledge of them is indispensable 

 for a proper comprehension of the whole) their physiological characters. 

 Again, in another section of the same, the organised units of the body, 

 the " structural or tissue-elements" will be brought in review, with their 

 shape and composition, purposes and origin, ultimate destiny and origin, 

 one from another. This constitutes "GENERAL HISTOLOGY AND HISTO- 

 CHEMISTRY." 



In the second division histology in the more restricted and real mean- 

 ing of the word the various tissues, in their anatomical relations and 

 composition, will be brought under notice. Here also we shall consider 

 the mode in which the form or structural elements of the first division 

 are employed in the building up of certain masses. It stands to reason 

 that here also the physiological characters of the tissues and their 

 origin must still be frequently referred to. 



A third division, finally, will be devoted to the consideration of the 

 more minute structure of the organs and systems of our body, or the man- 

 ner in which they are put together out of different tissues. This may be 

 termed " TOPOGRAPHICAL HISTOLOGY." 



