Letters - Ca-Cl Letters relating to the enquiry into albinism in man and animals from: <li>Cambridge University Press, John Clay, 1911-1915 - concerns Pearson's complaint about printing photographs </li> <li>Chambers, Raymond Wilson, 1910 - concerning references</li> <li>Cheatle, George Lenthal, 1908 (surgeon known for breast cancer research) concerning his work and whether Pearson would like to see it </li> <li>Clarke, Dorothy M, [1908] - concerning the colour of mice's eyes.</li> <li>Closta c1910 - concerning photographs of Hubert Anderson</li> [1908]-1915