Opticks: or, A treatise of the reflections, refractions, inflexions and colours of light
Printed for Sam. Smith, and Benj. Walford, London, 1704
148. After his first publication in optics (see Herald 144), Newton continued to study optics, and finally in 1704 he published this collection of his studies. In this book he discusses many phenomena including the colors that make up white light, the phenomena now called "Newton's Rings," and an explanation of double refraction to try and give him priority over Huygens's explanation.