CUTICLE OF EL^EAGNUS. 19 



shade, at the same time preventing a too rapid evaporation 

 of the moisture they had attracted. There are many 

 kinds of hairs on plants ; most beautiful are some of them, 

 especially those which secrete oils or saccharine matter. 

 These are called glandular hairs ; they rise up on a slender 

 stem, and expand into a globular head, filled with coloured 

 or white special secretions, such as we find on Sweet-briar 

 and Moss-rose buds, or on the leaves and flowers of 

 Collomia. 



CUTICLE OF AMARYLLIS. 



This example will show the to-lobed stomata, one 

 kidney-shaped cell on each side ; it is from any part of leaf 

 or stem of the common white Lily ; also compare the cells 

 with those of the 



CUTICLE OF INDIAN CORN. 



This is what is called a siliceous cuticle. All the grass 

 tribe and the plants called Equisetacese, or horse-tails, have 

 the property of attracting silex or flint from the soil in 

 which they grow : the cell walls and stomata become so 

 impregnated with it, that even soaking in nitric acid, which 

 destroys the vegetable part, leaves the skeleton, or frame- 

 work, perfect, as in this slide, which has been thus pre- 

 pared. Observe the finely -toothed edge of each cell, as 

 well as the peculiar shape of the four cells bordering the 

 pores. The stomata are very abundant in grasses; they 

 cover every part of the stem, and both sides of the leaves. 



CUTICLE OF SACCALOBIUM. 



The Saccalobium is one of the orchis tribe, a native of 

 Asia, found in the Indian Archipelago, and is cultivated 

 in hot-houses in England. The spiral fibre in some of its 

 cells forms a regular network on the inner surface. 



CUTICLE OF 



This is an opaque object ; the scales are very beautiful, 

 and when detached from the leaf and mounted in balsam 

 they polarize. 



