102 



BOTANY. 



however, by making a large number of very thin sections of the whole 

 leaf (by placing it between two pieces of elder pith), when it will be 

 found that in some cases stomata have been cut through in the man- 

 ner shown in Fig. 92. 



(6) Examples may be obtained from any of the higher plants, but 

 those which are of a firm texture and have a smooth epidermis are 

 best to begin with e.g., the hyacinth, tulip, the lilies, many grasses, 

 fuchsia, lilac, etc. 



(c) Weiss* determined the number of stomata on the epidermis of 

 both surfaces of 167 leaves of plants ; some of his results are given 

 below: 



*Ia a paper on the Number and Size of Stomata, published in 

 Pringsheim's " Jahrbucher fur Wissenschaftliche Botanik," 1865. 



