294 



LIGHT, HEAT, 



Sect, XIII. 



SECT 



XIII. 



OP LIGHT, HEAT, ELECTRICITY 



I. 1 . Li G H T and heat are different fluids. Light does not heat transparent bodies 



A glajs fire-Jcreen^ combines with opake bodies ^ and heat is detruded. 



Light 



combines with /olid oxygen y and with heat converts it into gas. Per/pration of 

 plants is decompojed by light. The hydrogen retained gives the green colour. Wa- 

 ter hyper-oxygenated. Oxygenated marine acid. Colour lefs nitrous acid. A branch 



^ed in carbonic acid and 



tng to oxygen 



3. Etiolation of vegetables . Bleaching 



of plants to hydrogeny and the yellow tan of thejk 



Pure 



from dew. Perjpiration of plants oxygenated. Light tans living bodies y and 



bleaches dead onesy both vegetable and animal 



Ufe of light in vegetable refp, 



N 



ration. ^ Plants do not rejpire in the night. Truffles and fungi live without Ugh 

 ^ . Spring water frequently oxygenated. Air liberated by points. 6 . Plants re- 

 quire oxygen, fallacy of contrary experiments. II. i. Heat univ erf al. Counter- 

 gravitation. Is the cauje of fluidity y and of aeriform fi ate. Particles of mat- 



Isfet at liberty in produ^ion of acids. 



:pands. Separates compound 

 Not of evergreens. Rime 



do not touch. Heat becomes combined. 



In freezing 



Frofi deflroys fluidity 



fluids from each other y and burfls the vejfels of plants 



frofi s and black frofi. 



fi 



Low fituations not proper for gardens. Ufe of cophigfi. 



Rows of young peas from S. E. to S. JV, 



Bendfig 



ground. Frofi erroneoufly believed to meliorate the f oily and to be wholejt 



rendered denfer by frofi 



Clay 



prote^s pli 



fiarved. Lichen rangift 



Animals covered withji 



3 . Cold deflroys vegetable irritabih 



Heat is a fiimulus . Acquired habits of plants. 4. Cold produced by evaporation 



watered in the funfh 



Electricity confifls of 



fluids. Forwards the growth of plants whether pofitive or negative. Lightning 



^em. 1. It aflifls the decompofttion of water in vegetables. 3. Clouds 



defl 



6 



dre 



