THE USE OF THE MICROSCOPE. 349 



11. Examine the different appearance of the globules of potato- 

 starch and the pollen from different plants under the same cir- 

 cumstances. 



12. Notice the microscopical characters of air-bubbles and oil- 

 globules,* and examine them by reflected and by transmitted 

 light.- 137, pi. XIX, figs. 122, 123, 124, 126, 



TABLE III. 



ON MAKING CELLS FOR PRESERVING MICROSCOPICAL SPECIMENS. 



13. Make a paper cell and attach it to the glass slide. 114. 



14. Make a thin cell with the aid of marine glue, and another with 

 tinfoil. 117, 1 1 8. 



15. Make some square thin cells of Brunswick black, and some 

 circular cells with the aid of Mr. Shadbolt's apparatus. 116, 

 pi. XVI, fig. 91. 



1 6. Cut some squares of thin glass, with the writing diamond. 



119- 



17. Cut some circular pieces of thin glass, using the brass circles. 

 119, pi. XVI, figs. 94. 95. 



1 8. Make some thin glass cells in the manner directed in 124, 



125, pi. XVII, fig. 99, and when complete, grind the upper 

 surface upon the emery slab, fig. 102. 



19. Cut with the glazier's diamond some slips of glass, three inches 

 by one inch, for slides. 119, pi. XVI, fig. 92. 



20. Make a cell of thick glass in the manner described in 127, 



128, pi. XVIII, figs. 109, no. 



21. Make a deep cell of gutta percha. The gutta percha must be 



softened in hot water and then moulded upon some object the 

 size of the required cell. 131. 



* Small air-bubbles can be obtained by shaking a little gum-water in a bottle. 

 A drop may then be placed upon a glass slide. Milk affords oil-globules in abun- 

 dance. 



