Leeds City Varieties | Varieties of Arabic | On the Tendency of Species to form Varieties; and on the Perpetuation of Varieties and Species by Natural Means of Selection | Italian traditional maize varieties |
In its original form, it was applied to an unramified double covering of a Riemann surface, and was used by F. Schottky and H. W. E. Jung in relation with the Schottky problem, as it now called, of characterising Jacobian varieties among abelian varieties.