J. C. Chatterji’s book is a brief introduction to the nature of ultimate reality and the manifestation of the universe according to the Trika System. It also covers, briefly, the history of this advaita Shaiva philosophy of Kashmir. First published in 1914 as the first book in “The Kashmir Series of Texts and Studies,” it is still the clearest introduction to the Tattvas of the Trika. Since the lower twenty-five of the thirty-six Trika Tattvas represent the entire universe from the (...) Samkhya point of view, here also is a very clear exposition of the Samkhya Tattvas. The only difference is that, while the Purusha and the Prakriti are the final realities for Samkhya, they are but derivatives according to the Trika, which, carrying the analysis further, recognizes eleven additional Tattvas above the Purusha. (shrink)

What ecological advantages do animals gain by being able to detect, extract and exploit wavelength information? What are the advantages of representing that information as hue qualities? The benefits of adding chromatic to achromatic vision, marginal in object detection, become apparent in object recognition and receiving biological signals. It is argued that this improved performance is a direct consequence of the fact that many animals' visual systems reduce wavelength information to combinations of four basic hues. This engenders a simple categorical (...) scheme that permits a rich amount of sensory information to be rapidly and efficiently employed by cognitive machinery of limited capacity. (shrink)

C A Wringe; Pupils’ Rights, Journal of Philosophy of Education, Volume 7, Issue 1, 30 May 2006, Pages 103–115, https://doi.org/10.1111/j.1467-9752.1973.tb00475.