EXPERIMENTS AND PRACTICAL WORK 41 



(a) Even or entire, e.g. mango, sour-sop, golden apple, 

 pimento. 



(b) Serrate (sawlike), e.g. rose, acalypha. 



(c) Spiny, e.g. pineapple, penguin. 



(d) Dentate (like teeth), e.g. Jack-in-the-bush, water lily 

 (Xelumbium). 



(e) Cremate, e.g. leaf-of-life, geranium. 



(/) Ciliate (with hairs), e.g. rex begonias. 



Expt. 38. Surfaces of Leaves. Collect four leaves 

 in each of the following classes, distinguished by their 

 surfaces 



(a) Smooth, e.g. pimento, mangrove, allamanda. 



(b) Rough, e.g. petrea, chocho. 



(c) Hairy, e.g. nettle, turnip, tobacco, velvet leaf. 



(d) Prickly, e.g. wild thistle. 



(e) Waxy, e.g. wild plantain, wax plant, French cotton. 

 Put a waxy leaf in cold water; note film of air; take out 

 and observe that leaf is not wet; rub oft" wax with soft 

 cloth and warm water; put back into cold water and 

 observe that leaf now gets wet. 



Expt. 39. Deciduous and Persistent Leaves. 



(a) Whenever you observe a plant bare of leaves (e.g. 

 red plum, cedar, genip, silk-cotton) record its name, to- 

 gether with a note of the time of the year at which it 

 regularly sheds its leaves. 



(b) Make a list of twelve trees that do not shed all 

 their leaves at regular seasons, e.g. lignum-vita?, mango, 

 lime, bread-fruit, sweet-sop. 



Expt. 40. General Collection. Make a large and 

 general collection of leaves, and sort them into the 

 following classes: 



(a) Simple and compound leaves. 



(b) Undivided simple and lobed simple leaves. 



(c) Parallel- and net-veined leaves. 



