6 PREFACE. 



The provision made for drawings in this manual will greatly facil- 

 itate that work. The foot-notes will indicate what the student is 

 to observe and illustrate, and by lettering the structures drawn, as 

 indicated in the descriptive foot-note, time and labor will be saved. 

 In connection with this work, black-board diagrams, hand-made 

 charts, and lantern projections can be used, that the student may 

 have the clearest possible conception of what the microscope reveals 

 before beginning his task with pencil or pen. 



A word to the student will not be amiss. The faithful student 

 will not be content to let another do his work. He will be deter- 

 mined to make every demonstration count. He will strive to be ac- 

 curate in his observations and painstaking in his notes and draw- 

 ings. Blots, finger marks and erasures will be studiously avoided. 

 In the laboratory he will keep everything in its place and clean up 

 after each exercise. He will not be satisfied with the statements 

 of one author, but will seek information from every available source. 

 These seem minor things, but they enter into character. Like 

 straws, they show the direction of the current. 



The writer desires to acknowledge his gratitude to kind friends 

 for encouragement, and especially to Dr. G. W. Hubbard, Dean 

 of Meharry Medical College, and J. H. Holman, M.D. , Instructor 

 in Histology and Bacteriology. He is under obligation to many 

 sources for the materials herein presented, but more especially to 

 the valuable texts of Stirling and Piersol on Histology, and of Mc- 

 Farland and Williams on Bacteriology. The student who would in- 

 vestigate these subjects more thoroughly is advised to secure one or 

 more of these works. The writer is aware that no new facts are 

 herein presented, and is fully conscious of the imperfections and 

 shortcomings of this manual, but hopes that the plan proposed will 

 be of service to some, and with this hope sends it forth to accom- 

 plish its purpose among others of kindred nature. 



WILLIAM OSBURN. 

 NASHVILLE. TENX., Aug-ust, 1899. 



