direct his evolution'". Final illness and the "Light of Evolution" Dobzhansky's wife Natasha died of coronary thrombosis on February 22, 1969. Earlier (on June 1, 1968), Theodosius had been diagnosed with lymphocytic leukemia (a chronic form of leukemia), and had been given a few months to a few years to live. He retired in 1971, moving to the University of California, Davis where his student Francisco J. Ayala had been made assistant professor, and where he continued working as an emeritus professor. He published one of his most famous essays "Nothing in Biology Makes Sense Except in the Light of Evolution" in 1973, influenced by the paleontologist and priest Pierre Teilhard de Chardin. By 1975, his leukemia had become more severe, and on November 11 he traveled to San Jacinto, California, for treatment and care. Working till his last day as a Professor of Genetics, Dobzhansky died (from heart failure) on December 18, 1975, in Davis, California. He was cremated, and his ashes were scattered in the Californian wilderness. Evolution and God Theodosius Dobzhansky believed that God and science can be reconciled through the idea that the Creator brought about his plan through the processes of evolution. He described his beliefs as "Evolution is God's, or Nature's, method of Creation." Publications During his career, Dobzhansky published widely in books and peer reviewed scientific journals: Books Sinnott, E.W., Dunn, L.C and Dobzhansky, Th. 1925. Principles of Genetics. McGraw-Hill. (5 editions: 1925, 1932, 1939, 1950, 1958; Dobzhansky co-editor only on 1950 & 1958 editions). Dobzhansky, Th. 1937. Genetics and the Origin of Species. Columbia University Press, New York. (2nd ed., 1941; 3rd ed., 1951) The Biological Basis of Human Freedom (1954). Dunn, L. C., & Dobzhansky, Th. 1946. Heredity, Race, and Society. The New American Library of World Literature, Inc., New York. Dobzhansky, Th. 1955. Evolution, Genetics, & Man. Wiley & Sons, New York. Dobzhansky, Th. 1962. Mankind Evolving. Yale University Press, New Haven, Connecticut. Dobzhansky, Th. 1966. Heredity and the Nature of Man. Harcourt, Brace & World Inc., New York, New York. Dobzhansky, Th. 1967. The Biology of Ultimate Concern. New American Library, New York. Dobzhansky, Th. 1970. Genetics of the Evolutionary Process. Columbia University Press, New York. Dobzhansky, Th. 1973. Genetic Diversity and Human Equality. Basic Books, New York. Dobzhansky, Th., F.J. Ayala, G.L. Stebbins & J.W. Valentine. 1977. Evolution. W.H. Freeman, San Francisco. Dobzhansky, Th. 1981. Dobzhansky's Genetics of