| http://www.w3.org/ns/prov#value | - The shoots of most plants incline towards the light or are 'positively heliotropic'; while others, such as the climbing shoots of the ivy and pumpkin, turn away from it, or are 'negatively heliotropic.??? As these differences are highly purposeful???inasmuch as in one case they put the plant in a position to make the utmost use of the light, and in the other enable it to climb???we must look upon
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