RELATION BETWEEN MINERALS, PLANTS, ETC. 27 
Plants, as well as animals, need a season of repose. 
Both have their epidemics. On both, narcotic and acrid 
poisons produce analogous results. Are some animals 
warm-blooded? In germination and flowering, plants 
evolve heat—the stamens of the Arum, e. g., showing a 
rise of 20° F. In a sense, an Oak has just as much heat 
as an Elephant, only the miserly tree locks up the sunlight 
in solid carbon. 
At present, any boundary of the Animal Kingdom is 
arbitrary. “ We cannot distinguish the vegetable from the 
animal kingdom by any complete and precise definition. 
Although ordinary observation of their usual representa¬ 
tives may discern little that is common to the two, yet 
there are many simple forms of life which hardly rise high 
enough in the scale of being to rank distinctively either as 
plant or animal; there are undoubted plants possessing fac¬ 
ulties which are generally deemed characteristic of animals; 
and some plants of the highest grade share in these endow¬ 
ments.” 10 
CHAPTER IIP 
RELATION BETWEEN MINERALS, PLANTS, AND ANIMALS. 
There are no independent members of creation: all 
things touch upon one another. The matter of the living 
world is identical with that of the inorganic. The plant, 
feeding on the minerals, carbon-dioxide, water, and am¬ 
monia, builds them up into complex organic compounds, 
as starch, sugar, gum, cellulose, albumen, fibrin, casein, and 
gluten. When the plant is eaten by the animal, these sub¬ 
stances are used for building up tissues, supplying energy, 
repairing waste, laid up in reserve as glycogen and fat, or 
oxidized in the blood to produce heat. The albuminoids 
are essential for the formation of tissues, like muscle, nerve, 
