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Subj:.....The Canals On Mars (S611)           From the book             "Mathematical Puzzles of Sam Loyd"              Edited by Martin Gardner              From: Dover Publications in 1959   Here is a map of the newly discovered cities and water- ways on our nearest neighbor, Mars.  Start at the city marked T, at the south pole, and see if you can spell a complete English sentence by making a tour of all the cities, visiting each city only once, and returning to the starting point. When this puzzle originally appeared in a magazine, more fifty thousand readers reported, "There is no possible way."  Yet it is a very simple puzzle.

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