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Diagrams of Zoology
Dec. 18, I879] NATURE 153 ing a correspondence between the t points of the cubic T associated with the quadrilateral T, and the similarly determined u point, and proceeds to examine all the cases in which this correspondence is uniform, i.e., when to a point of each curve corresponds a single point of the other curve. He then shows that all other cases may be reduced to this case of uniform correspondence. His conclusion, after a discussion of these equations of condition, is that there are 1lOdoi:10.1038/021153b0 fatcat:3ecoiz2s4rattdvnqrn2yenu3u