Five species. Stove aquatics. Seed and division. Rich loam in water. Mr. A. Scott, gardener to Sir G. Staunton, Bart., gives the following directions for cultivating N. specio-sum: -

"Let it be kept dry during the winter, in a cool part of the plant stove, at about 50° Fahrenheit. In February, the roots to be divided and potted separately in turfy loam; the pots set in pans of water; the temperature of air from 65° to 90°; temperature of the water in the cisterns being about 75°. In May plant out in a water-tight box, three and a half feet long, one and a half foot wide, and sixteen inches deep, filled with loamy soil, having a little gravel on the top to give it solidity, and allowing room for about two inches of water over the surface of the soil. Plunge the box into the bark bed ; the temperature of the soil and water in the box 80°. This bottom heat maintain during the summer, the temperature of the house varying from 65° to 90°." - Hort. Soc. Trans. N. luteum is indigenous to the United States, though only found growing spontaneously in certain quarters. It has been introduced into the meadow ditches below Philadelphia, where it thrives luxuriantly.

We have seen it finely developed in artificial ponds, evincing that it is of easy culture.