PLANTS AND ANIMALS 



153 



to graft apple trees; if he wants to learn why the process 

 works, a book will tell him that the cells of the one plant 

 unite with those of the other, and that the protoplasm of 

 these cells multiplies rapidly until a perfect union is ef- 

 fected. But what do these terms mean? Farm papers 

 and farmers' bulletins, in trying to explain important 

 matters, are compelled 

 to use many other such 

 terms. The farmer who 

 cannot understand them 

 is shut out from the 

 cheapest and most ac- 

 cessible information 

 about his work. 



102. Plants and Ani- 

 mals. Any one can dis- 

 tinguish a horse from a 

 tree, or even a worm 

 from a root. The horse 

 grows to a definite size, 

 moves from place to 

 place, and has special 

 organs for the taking in 

 of food and air. In a 

 word, it has a complicated body whose many parts have 

 widely different structures and uses. 



A tree must stay where it has been planted ; its limbs 

 may sway, its leaves may flutter, and its roots advance 

 into the dark soil, but it cannot move away. The body 

 of the tree, too, is made up of parts that show differences 

 of structure and use, but these parts are few in number 

 and simple in their relation to one another. No central 

 station like the brain of the horse controls all the other 

 parts of the tree's body. Each organ of the tree does more 



TIMOTHY IN BLOOM. 

 Note the falling anthers. 



