366 Wm. Loii'e : Troiyics and Pigmeni. 



We can, again, sum iij) the discussion by affirming of vegetable 

 pigments : — 



(1) Tliat the pigment, in proportion to the density of 

 its deposit, renders the tissues opaque to the sun's rays. 



(2) That pigment transforms these energies into heat. 



(3) That the temperature of the pigment reacts on 

 the circulation of the sap. 



Tlius heated pigment induces the transpiration of fluids 

 whereby heat is dissipated. 



