PREFACE. 



The need of a text-book of histology arranged upon an embryological 

 basis has long been felt. At the Harvard Medical School this need has 

 been urgent. There Professor Schaper, the editor of the five previous 

 American editions of Stohr's Histology, planned such a book, and after his 

 return to Germany ks preparation was begun. It is greatly to be regretted 

 that at the time of his death the work was only commenced, for there was 

 promise of a notable production. 



When the writer was informed that Professor Stohr had given gener- 

 ous permission to adapt a new edition of his Histology to American needs 

 it was decided to rearrange the book upon an embryological plan. This 

 has been accomplished with the loss of some characteristic features of the 

 German edition, for which the added material will, it is hoped, make com- 

 pensation. Thus in order to have space for describing the controlling de- 

 velopmental features of the organs, and for presenting their adult structure 

 somewhat more fully, the directions for preparing sections have been 

 reduced to the minimum. These may be supplemented by directions in 

 the class room; and for the small proportion of students who intend to 

 practice elaborate microscopical methods, a special text-book may be rec- 

 ommended. It is not essential that a physician should be familiar with the 

 details of many staining processes, but the structure of the adult organs and 

 the developmental possibilities of their constituent tissues must be known. 



The nomenclature adopted is that published by the committee of the 

 German Association of Anatomists in 1895 (Arch. f. Anat. u. Phys.; Anal. 

 Abth.; Supplement-Band], and which is now widely used. It is founded 

 upon the sound principle that the name of a structure should be the simplest 

 possible descriptive Latin term or phrase. Since the Latin names may be 

 translated into the various modern languages the nomenclature is inter- 

 national. Moreover a large number of the names are commonly used in 

 their Latin forms. Personal names have been discarded (except Wolffian 

 and Mulleriari), thus greatly assisting the student. It is obviously 

 easier to learn intestinal glands, duodenal glands, parotid duct, etc., rather 

 than Lieberkiihn's glands, Brunner's glands, Stenson's duct, and the like. 

 It has been estimated that five thousand synonyms have been rejected and 

 are to be removed from the anatomist's vocabulary as soon as possible. 

 In the following pages the more common of the rejected names have been 

 placed in square brackets, [ ]. However difficult it may be for the older 



