28 



PLANT PROPAGATION 



The acid method is found in nature; for seeds of many fruits are 

 softened Ijy the acids of the fruits themselves or by those in the 

 stomachs and intestines of birds and animals that eat the fruits 

 (barberry, cedar, cherry, mulberry, thorn, etc.). 



48. Mechanical helps are used for seeds whose coats 

 are too hard to be affected by any of the methods so far 

 described. Filing or boring holes in Abyssinian banana, 







FIG. 22— STUDENTS AT PENNSYLVANIA STATE COLLEGE 



\. Settinji cabbage plants. 2. Student vegetable gardens. Dairy barn in rear. 

 Each student does his quota of work in the field. From 125 to 150 plan and 

 tend their gardens each spring semester. 



