HEELING IN. 



419 



the operation of " heeling in." Figs. 172 and 

 173 will help the reader to a clearer idea of the 



Fig. 171. 



operation. Fig. 172 shows the trencn opened 

 and the plants laid in, ready to be covered. 



Fig. 1T2. 



Fig. 173. 



Fig. 173. shows the trench filled and the plants 

 covered. 



