In studying, during the last five years, the phenomena of Mind in the Lower Animals, I have encountered as great difficulty in drawing any definite or definable Psychical Line of Demarcation between Plants and the Lowest Animals as between the Higher Animals and Man. In other words, it appears to me that certain attributes of mind, as it occurs in Man, are common to Plants. The only alterative is the omission from our conceptions and definitions of Mind of certain phenomena common to plants with all classes of animals, including man—those, namely, that do not involve what we distinctively call consciousness. But the difficulties of such an elimination seem to me insuperable.
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