Howard Leslie Cornell, M.D., (1872-1938) was a naturopathic physician with practices in the US and India. In 1918 he set about to compile all the medical references in his many astrology books. It became a momentous task and the work eventually came to comprise two enormous volumes. The result of 15 years' work is this one-of-a-kind text, which was first published in 1933. It has been widely sought-after ever since and remains the one indispensable medical astrology book in existence.