Lithuanic language. See [Language]
Locke on ideas, [20-23], [28-30], [65], [342]
Logic, of recepts, [chap. iii.];
of concepts, [47], and [chap. iv].
Long on gesture-language, [120]
Lubbock, Sir John, on communication by ants, [94], [95];
on teaching a dog written signs, [101], [102]
Lucretius on the origin of speech, [240]
Ludwig on demonstrative elements, [244]
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