Through this group he became aware of the British Pre-Raphaelite Brotherhood.
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In 1863, with Clarence King and John William Hill he helped to found the Society for the Advancement of Truth in Art, an American group, similar to the Pre-Raphaelites, who published a journal called The New Path.
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Cook was known for his expertise in archeology and antiquities and was instrumental in the criticism of the collection of General di Cesnola.
Grundriß der Kunstgeschichte (1860; thirteenth edition, 1899–1907; English translation, under the title Outlines of the History of Art by Clarence Cook, 1878, and reëdited by Russell Sturgis, New York, 1904)
James Cook | Clarence Thomas | Cook Islands | Cook County, Illinois | James Cook University | Cook County | Clarence Darrow | Cook | Captain Cook | Dane Cook | David Cook | Ready Steady Cook | David Cook (singer) | Barbara Cook | Cook Strait | Survivor: Cook Islands | Clarence "Gatemouth" Brown | Roger Cook | Robin Cook | Rachael Leigh Cook | Cook County, Minnesota | Clarence Mason | Clarence House | Clarence | Thomas Cook | The Cook, the Thief, His Wife & Her Lover | Prince Albert Victor, Duke of Clarence and Avondale | Port Clarence | Paul Cook | Glenview, Cook County, Illinois |
Before his career was over he had fought such notable opponents as Clarence Cook, Sugar Boy Nando, Del Flanagan, Art Hernandez, Pat O'Connor.