Abstract: THERE are few fallacies which have done more to mislead the unscientific public than the misconception known as the fourth dimension. The use of this term is calculated to convey the false impressions, first, that hypergeometry is limited to space of four dimensions instead of being extended to space of n dimensions where n is any positive integer; second, that even not going beyond tour dimensions, there is one particular coordinate called the fourth dimension which stands out from the rest, and alone is worth considering.