
Reply upon being asked how he made his discoveries, as quoted in " Biographia Britannica: Or the Lives of the Most Eminent Persons who Have Flourished in Great Britain from the Earliest Ages Down to the Present Times, Volume 5 http://books.google.es/books?id=rYhDAAAAcAAJ&pg=PA3241&dq=I+keep+the+subject+constantly+before+me+and+wait+till+the+first+dawnings+open+little+by+little+into+the+full+light.&hl=es&sa=X&ei=ZBsMUpiLDpPU8wTEkYGAAQ&ved=0CEMQ6AEwAg#v=onepage&q=I%20keep%20the%20subject%20constantly%20before%20me%20and%20wait%20till%20the%20first%20dawnings%20open%20little%20by%20little%20into%20the%20full%20light.&f=false", by W. Innys, (1760), p. 3241.