84 



VARIOUS FOOD-PLANTS 



Fig. 89. — Tomato. Hower, cut vertically, enlarged. Fruit, side view. 

 Same, cut across. Seed, cut vertically to show curved germ, in seed- 

 food. (Redrawn from Nees.) 



rid of as well as it can or allows to accumulate where they 

 will do the plant no harm. The coloring matters and flavor- 

 ing substances of the vegetables already studied are examples 

 of such by-products. 



All of the chemical changes taking ])lace in the living parts of an 

 organi.sm are together called inetaboUsm,^ the constructive changes 

 behig distinguished as anabolism ,- and the destructive ones as catabo- 



1 Mct-ab'o-li.sm < Gr. tueta, beyond; hallcin, throw. 



2 An-ab'o-lism < Gr. ana, upward. 



