36 THE SCIENCE OF LIFE. 



Glycogen, is found in the liver and in the brain. Chlo- 

 rophyll, which makes the leaves of vegetables green, 

 is found among animals, as in Stentor, (the trumpet- 

 shaped animalcule,) and in Hydra viridis, (the green 

 hydra.) 



13. As to locomotive power, bioplasm is essentially 

 active, as I have described, both in plants and animals. 

 The zoospores of Algae are covered with cilia, and move 

 in water like animalcules. Motion is common among 

 Diatoms, Desmids, Oscillatoria, and other classes of 

 plants, while Sponges, Corals, Oysters, and Barnacles 

 are largely destitute of locomotive power. 



14. With respect to food, plants live generally on min- 

 eral or inorganic matter, chiefly water, carbonic acid, and 

 ammonia, while animals require ready-made organic 

 compounds to support life. Thus plants manufacture 

 and animals consume organic pabulum. Yet Fungi, 

 which are generally classed with vegetables, feed as 

 animals on organic matters, and insectivorous plants, as 

 Darwin has shown, feed on animals. 



15. Animals generally possess sensation, conscious- 

 ness, and volition, yet there is a kind of sensation in the 

 sensitive plant, Venus' fly-trap, etc., and something like 

 volition in zoospores, or they would often collide in the 

 active dance they keep up. Plants need rest as well 

 as animals. Both have their epidemics, poisons, and 

 remedies. 



16. If we admit a dualism, or spiritual cause of life, in 

 vegetables, as well as in animals, it does not prove them 

 immortal. Immateriality does not imply immortality. 

 Existence, spiritual or material, depends on the will of 



