We often have requests to notice catalogues, but on account of the immense number of excellent ones which come to our table we have, for want of space, to limit ourselves to cases where some special point of novelty attracts attention. It surely is a novelty to find a catalogue in America exclusively devoted to that beautiful tribe of flowers, Orchideae. Here is one by Mr. A. Brackenridge, of Govanstown, Md., occupying twenty-two pages. It must indicate a rapidly growing taste for these beautiful things when a nurseryman can keep such a nice collection, and feel warranted in making an expensive catalogue of them.