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Evolutionary aspects of autotrophy

The commencement of the writing of this review coincided with the first microbiological experiments conducted on the surface of Mars, within the Viking spacecraft. Thus, on the one hand scientists speculate on the sequence of events which led to the development of life on this planet a few thousand million years ago, while on the other hand, a man-made scoop measures out Martian soil into culture vessels in order to see whether life has ever developed or is likely to develop on another planet of the solar system more than 35 million miles away. The fascination of this arching of the intellect is