40 The Microscope. 



to its form and habits, and is easily recognizeable from all other 

 forms. It is intensely parasitic and wonderfully prolific among 

 the mucous corpuscles. 



THE WORKING SESSION OF THE AMERICAN SOCI- 

 ETY OF MICROSCOPISTS. 



THE Executive Committee of the American Society of Micros- 

 copists having appointed me Director of the Working 

 Session of the Society at its next meeting, and placed in my 

 hands the arrangement of the work and details of the session, 

 I have prepared the following scheme of work to be illustrated 

 in the Working Session at the meeting of the Society in Cleve- 

 land next August. The general theory of the plan is to illus- 

 trate methods of research in the main, leaving the details which 

 are merely matters of mechanical execution to be treated as 

 subsidiary matters, since the available limits of the Working 

 Session are insufficient to fully cover the whole ground at any 

 one meeting. 



The plan is submitted, not as being complete or approach- 

 ing perfection, but as covering nearly all that can be well illus- 

 trated at a single session within the limits of time and space at 

 present available. 



SCHEME OP DEMONSTRATIONS. 



1. The use of the Micro-Spectroscope and its applications to 

 original research. 



2. The utilization of the Polariscope in original investigations. 



3. Micro-photography, and its applications as an aid to research. 



4. The use of the Camera lucida, various styles and methods. 



5. Micrometry ; illustration of different methods. 



6. Cultivating Bacteria, exposition of different methods. 



7. Injecting vessels and tissues, exposition of different methods. 



8. Staining tissues, etc., in mass. Simple and compound stain- 

 ings. 



9. Staining sections. Simple and compound stainings. 



10. Section cutting — soft tissues. Use of various microtomes. 



11. Section cutting — hard substances. Methods of cutting and 

 grinding. 



12. Section cutting. Serial sections. 



13. Use of the Dissecting Microscope. Methods and apparatus. 



14. Practical demonstration of the relation of aperture to power 

 in microscope objectives. 



