2 One Thousand Objects 



with a power higher than one inch, and after that to em- 

 ploy a half-inch, a two-thirds, or a quarter, if desirable ; 

 but the greatest satisfaction will always be derived from a 

 good practical use of low powers. 



The objects selected for this work are common, easily 

 obtained, readily mounted, and are all within the compass 

 of an instrument not costing more than five guineas. 



SECTION I. VEGETABLE. 



1. CUTICLE OF LEEK (Allium porrutii). The cuticles 

 of the leaves of plants furnish a very interesting series of 

 objects, and may be easily removed and mounted. Two 

 modes are recommended : one by maceration, which 

 occupies three weeks or more ; the other by boiling in 

 dilute nitric acid. Cuticles may be mounted dry, in bal- 

 sam, or in glycerine jelly. In the Leek the cuticular cells 

 are quadrangular and much elongated, with numerous 

 stomata of about the same breadth as the cells. (PI. I., 



% 34-) 



2. CUTICLE OF YUCCA (Yucca gloriosa). This is a 

 favourite cuticle. The plant is commonly cultivated, and 

 the cuticle easily removed. The cells are much less re- 

 gular than in the leek, not so long, obscurely hexagonal, 

 and not arranged in such symmetrical lines. The stomata 

 have also a different form. 



3. CUTICLE OF STRAW (Hordeum vulgare). The flinty 

 cuticle of barley-straw may be obtained by incineration. 

 The rectangular elongated cells are similar in form and 

 order to those of the leek, but the sides are bluntly toothed 

 throughout their length. The stomata are smaller and 

 vnore numerous. 



4. CUTICLE OF DUCKWEED (Lemna minor). It is not 

 difficult to obtain the cuticle of this very small plant. The 

 cells are not arranged so much in lines as the yucca, but 



