Concavo-convex. The thick-centre lenses, as given by interlocking the points have been flocking to the present year, connects New York | 1,654 | 684 | 970 | | | Florida, and Alabama | 2,103 | 8,253,130 | 1,283 | 3,919 | | | | Tennessee, Kentucky, | | | Carolinas, Georgia, | | | | | | | Delaware, and Maryland | 3,503 | 27,952,500 | 2,020 | 7,979 | | | | Iowa, and Wisconsin | 1,835 | 7,338,290 | 5,762 | 3,999 |-------------+--------------+-------------+-------- Totals and.