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Noted In Children Brought: Study of twins has shown considerable retardation of language attributable to the absence of a need for verbal communication. Similar retardation has been noted in children brought up in institutions where the youngsters received little personal attention. Children in the primary grades should have as much opportunity as possible to talk spontaneously. Recordings of the spontaneous conversation (32, 1955) of four children, four, eight, and nine years of age, show the following topics: clubs, club rules, fighting, storytelling, baiting a younger child, sex, and sex organs.
There are many opportunities for children to comprehend quantities by seeing collections of definite numbers of things: 50 books, 100 pencils, 75 children on the platform, 90 tickets, a pile of 150 apples brought by the children as a Thanksgiving gift, and similar groups of known number.
On August 26 he addressed the members on the daguerreotype. He stated that he had long since studied the light sensitivity of silver iodide but found it too weak to be of practical use; Daguerre's contribution, he noted, was that a feeble image "can be increased, brought out, and strengthened at a subsequent time, by exposing the plate to the vapours of mercury."32
The publication of the photographic processes of Talbot and Daguerre brought forth a host of claimants for priority. Of these, the most convincing came from Brazil and Norway.
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