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In page Sarah Brown Ingersoll Cooper:

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The rapid growth of the free kindergarten system in California had its first impulse in six articles written by Mrs. Cooper for the San Francisco Bulletin in 1879. The first of these was entitled "The Kindergarten, a Remedy for Hoodlumism," and was of vital interest to the public, for just at that time, ruffianism was so terrific, that a vigilance committee was organized to protect the citizens. The second article was "The History of the Silver Street Free Kindergarten."[citation needed]