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A herbarium is better than any illustration; every botanist should make one.
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Stones grow, plants grow, and live, animals grow live and feel.
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When all the thoughts are concerning one thing and the person loses interest in other things, the melancholy begins.
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It is not God, but people themselves who shorten their lives by not keeping physically fit.
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Nature's economy shall be the base for our own, for it is immutable, but ours is secondary. An economist without knowledge of nature is therefore like a physicist without knowledge of mathematics.
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We admit as many genera as there are different groups of natural species of which the fructification has the same structure.
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It is the genus that gives the characters, and not the characters that make the genus.
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The plant kingdom covers the entire earth, offering our senses great pleasure and the delights of summer.