Abstract
In “The Angel in the Machine” I argue that the substantial concept of mind is heir to a number of consequences not previously appreciated, included among which (but not limited to) are both Solipsism and Atheism. In addition, I suggest that the difficulties I indicate were to some extent already understood by Aristotle who seems to have laid the foundation for two concepts of mind, one associated with human beings, the other with Angels. His distinction is recalled in the Middle Ages, but seems finally to be lost in Descartes who appears to have linked the angel mind-concept to human beings and dispensed entirely with the concept that Aristotle originally reserved for the human. Hence “the Angel in the Machine”.