Each normal C n image of a line meets each base 5 n _2 in n -2 points and does not intersect the ruled variety.The images of planes intersect R in (n-\-l)(n -2)/2 lines. The plane meets each base 5 n -2 in a point, the image of which is a line meeting n of the base 5 n '_2 and lying on F 2 . Each base S n -2 meets R in a manifold of dimensionality n -3 and of order n -1. For ^ = 4, the two-dimensional variety of order 5 has an infinite number of plane elliptic cubic curves, but the corresponding property is not true for larger values of n although the intersections of each base S n -2 and R are birationally equivalent.
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