CONTENTS 



THE MICROSCOPE 



CHAPTER I. 



PAGE. 



Preliminary consideration of light rays, plane and spherical mir- 

 rors, refraction, index of refraction, prism, dispersion, 

 lenses, formation of an image 9-16 



Spherical and chromatic aberration, achromatic and aplanatic 



lenses 17-19 



Simple microscope, condition of distinctness of the image, near- 

 sighted, far-sighted, and astigmatic eyes, measure of mag- 

 nification 19-20 



Compound microscope, description of parts, condenser (Abbess), 

 illumination, objectives, dry and immersion objectives, 

 angular aperture of lenses ." 21-25 



Oculars, Huyghens' ocular, positive and negative oculars, method 

 of changing oculars and objectives, tube length, camera 

 lucida, determination of magnification in a microscope, 

 stage micrometer, source of light 25-27 



Requisites of a good microscope Working distance, focal depth, 



flatness of field, defining power, resolving power 27-28 



Care of microscope and directions for using same, accessory ap- 

 paratus ' 28-29 



VEGETABLE HISTOLOGY 



CHAPTER II. 

 Linen, cotton, silk, wool, hemp, jute, Manila hemp 30-33 



CHAPTER III. 



Yeast Plant (Torula), yeast-cake, "top" and "bottom" yeast, Pas- 

 teur's solution 33-35 



