By means of philosophical considerations and, secondly, through specific examination of experimental facts, the author inestigates the notion that DNA is “the secret of life.” An objection is raised that use of the word “code” in references to DNA involves nothing more than a metaphor. This and other objections are studied regarding DNA as a material, efficient, and formal cause. Objection is raised against the idea that memory is the encoding of experiences in DNA. Examination of experimental data brings out denial of the normal expectation that complicated organisms would have larger amounts of DNA than less complex forms. Facts indicate that DNA is influenced by environment as well as heredity. Comparisons are presented between results of in vitro and in vivo experiments involving DNA. The author concludes from his theoretical arguments and from experimental evidence that DNA is not the whole cause of life and heredity. DNA is a material cause, but the author asserts there still must be a formal cause.