Without mentioning the name of Holden, but referring to his investigations, which, in spite of the defects mentioned, are of the very highest merit, M. W. Humphreys, Professor of Greek in Vanderbilt University, Nashville, has published a similar treatise, based on observations of his own ("A Contribution to Infantile Linguistic," in the "Transactions of the American Philological Association," 1880, xi, pp. 6-17). He collected, with the help of a dictionary, all the words that a little girl of just two years "had full command of," whether correctly pronounced or not, and whether they appeared exactly in the twenty-fourth month or earlier. He simply required to be convinced that every one of the words was understood and had been spontaneously used, and could still be used. He did not include proper names, or words (amounting to hundreds) from nursery-rhymes, or numerals, or names of the days of the week, because he was not sure that the child had a definite idea associated with them. The vocabulary thus numbered 1,121 words: 592 nouns, 283 verbs, 114 adjectives, 56 adverbs, 35 pronouns, 28 prepositions, 5 conjunctions, and 8 interjections. In this table irregular verb-and noun-forms are not counted as separate words, except in the case of defective verbs, as _am_, _was_, _been_. The author presents the 1,121 words according to their classification as parts of speech, and according to initial _letters_, not according to initial _sounds_, although he himself declares this an erroneous proceeding, as I did in discussing Holden's paper. The only reason for it was convenience. In the adoption of a word by the child, difficulty of utterance had some influence in the _first_ year; when the little girl was two years old, this had ceased to have any effect whatever. She had by that time adopted certain substitutes for letters that she could not pronounce, and words containing these letters were employed by her as freely as if the substitutes had been the correct sounds. In regard to the meaning, and the frequency of use dependent upon it, it is to be observed that the simplest ideas are most frequently expressed. When two words are synonymous, one of them will be used exclusively by a child, because of the rarer employment of the other by persons speaking in the child's presence. Here, too, the local "tone" that has been mentioned made itself felt; thus, the little girl used the word "crinoid" every day, to designate sections of fossil crinoid stems which abounded in neighboring gravel walks. As to parts of speech, nouns were most readily seized; then, in order, verbs, adjectives, adverbs, pronouns. Prepositions and conjunctions the child began to employ early, but acquired them slowly. Natural interjections--_wah_, for instance--she used to some extent from the beginning; conventional ones came rather late. The following observations by Humphreys are very remarkable, and are, in part, up to this time unique: