it over.? Two days later, he had his laboratory. ?Yesterday I saw the Professor of Physics (J. J. Thompson, also a Fellow of Trinity College ) , and have made arrangements to start a laboratory in the building for physics. I shall set up apparatus to make original research, and look after any who wish to study the subject.? Thus, the world?s first laboratory devoted to psychometric study was established within the Cavendish Laboratory, one of the most significant buildings in the history of modern science . The Cavendish Laboratory was later to house 21 Nobel Prize winners, including Earnest Rutherford, awarded for the splitting of the atom, and James Watson and Francis Crick for the discovery of the double helix structure of DNA. Much of the apparatus was Cattell?s own, designed for his PhD work and manufactured in Germany using the same facilities as Wundt. Cattell also had access to equipment from Galton?s Anthropometric Laboratory in South Kensington, and had some built by Horace Darwin?s ?Cambridge Scientific Instrument Company?. Horace Darwin was Charles Darwin?s son. Although Cattell received no financial support from the University for his laboratory, he was allowed by the Physics Laboratory?s Director, J. J. Thompson (who was later to become well-known for the discovery of the electron), to use some of the laboratory?s own equipment and technical services, and was provided with a ?boy in wait?. Henry Sidgwick, the Professor of Moral Philosophy also donated 200 (Sokal, 1972). Cattell's ?mental tests? included those of reaction time,