| OCR Text |
Show i b Cause of Leaves' Change of Color. When rnp ceases to How hi tho nil-tumn, nil-tumn, and tho natural grdwth of tho trro ceases, oxidation In tho lenvcS takes place. Under this oxidation tho leaves chango to red, or, with a slight chnngo of tho condition, It might be yellow or brown. This, howovor, Is only the chemical explanation. Life, or, as wo would say, vital power, has to bear a part. If a branch Is entirely entire-ly cut off from the main plant, no chango of color occurs. On tho other bund, It a branch Is Injured,, though not entirely cut off from the tree, n chnngo of color lakes place, oven If It ho mld-summor. In other words, chemistry chem-istry alone cannot account for the bright colors of autumn follago; the mysterious power w? call llfo has to work at tho same time. |
