Known that the Hevea tree usually furnishes very inferior rubber if tapped before it is six or seven years old, and there is evidence to show that the quality of the rubber improves with the age of the tree. [Please select]
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Do you know, Handel, he improves. [Please select]
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It improves with age if properly kept. [Please select]
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If you knew how it improves you, you'd be doing it all of the time. [Please select]
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A few drops of sulphuric acid quickens and improves the action. [Please select]
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The _best_ breeding is to cross or mix the races; this process improves the breeds, in all respects. [Please select]
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