THE TREE DOCTOR 



Photo 77 

 Roots of Trees Correspond in Form to Tops. 



number of lessons which are daily spread before his self-closed 

 eyes. 



Turn to Photo 77. This shows an excavation in a sand- 

 bank. Above is standing an Apple tree about twenty-five years 

 old. This is very light, porous soil, and there are strong roots 

 found here, fourteen feet from the surface, and the tips of these 

 roots are probably ten feet or more further down. Probably 

 if the soil were sufficiently deep, and thoroughly porous, the 

 roots would plunge down or spread out to almost the exact form 

 and dimensions of the top. In Sandusky, O., I saw where a 

 ditch was being dug close by some Elm trees. It was loose soil, 

 about one-half fragmentary lime-stone rocks. This soil was full 

 of Elm roots, arid when the solid rock was reached, five feet from 

 the surface, there was a perfect, matted, net-work of roots,* 

 completely covering the bed rock. 



See Page 59, "PRIMER ON TREES AI^D BIRDS." 



