00344cam a22001091  4500082001200000100001900012245006200031250001200093260004700105300007100152650001100223  a535 TYN1 aTyndall, John,10aSix lectures on light delivered in America in 1872-1873 /  a6th ed.  aNew York :bD. Appleton and company,c1906  a3 p. l., [v]-xvii, 272 p. :bfront. (port.) illus., pl., diagrs. ; 0aLight.