6 PREFACE. 



wishes to express his gratitude to the National Baptist 

 Publishing Board for the excellent and artistic manner 

 in reproducing the illustrations and getting out the 

 work. 



The author embraces this opportunity to acknowl- 

 edge his obligations to the following authorities for 

 information, viz.: Sobotta's Human Histology, Bohm 

 and DavidofFs Histology, Leroy's Essentials of His- 

 tology, and McFarland. Eyre and Sternberg's Bacteri- 

 ologies. J. H. HOLMAN. 



Meharry Medical College, Nashville, Tenn., May, 

 1903. 



