These plants are not long-lived under our artificial treatment. There is something wanted that we do not or cannot supply, and hence it is difficult to keep them for any long period in a thriving condition. They seem, indeed, to wear themselves out by over-flowering or other causes which are very difficult to find out. The same thing happens in the case of some other Orchids. The bulbs of these plants should, if possible, be kept from shrivelling. They often seem inclined to shrivel after they have bloomed freely, and sometimes they lose their roots, especially when they have their flower-spikes left on too long. If the plant is not in a vigorous condition, it should not be allowed to bloom. We find they do best at the coolest end of the Cattleya house, kept as near to the glass as possible, but shaded from the hot sun, with sufficient water to keep them moist during the growing season. Insects should be assiduously kept in check, for cleanliness is a great point in the culture of all Orchids. The plants are subject to the attacks of white scale and thrips. In all cases every effort should be made to keep the roots of the plants from being eaten off, as this would soon cause the bulbs to shrivel and the plants to dwindle away. Mr. Bull’s Exhibition of Orchids.—We have been particularly pleased with this grand Exhibition. We thus see what the perseverance, courage, and enterprise of one man can do in bringing together a magnificent show of these gorgeous flowers for the gratification of the public—a show which enables them without any personal inconvenience to gaze upon and admire the wonderful floral products of distant lands. Indeed, even if the visitors to Mr. Bull’s exhibition had travelled to their native habitats, they could not have seen the plants under the same advantages, for many of them grow on high trees and rocks almost out of sight, and the different genera are nowhere to be found associated, except artificially, as Mr. Bull has them in his Orchid house. There in the month of June we saw some thousands of blossoms of different kinds of _Cattleya_, _Odontoglossum_, _Oncidium_, _Lælia_, _Vanda_, _Masdevallia_, _Anguloa_, _Epidendrum_, _Sobralia_, _Cypripedium_, _Aërides_, _Saccolabium_, _Dendrobium_, _Phajus_, _Cœlgyne_, _Brassia_, _Calanthe_, _Chysis_, _Cymbidium_, _Disa_, _Lycaste_, _Maxillaria_, _Phalænopsis_, _Sophronitis_, _Thunia_, and various other genera, groups of each kind being in many cases arranged in masses of different colours; the whole being intermixed with Ferns, Palms, and other fine foliaged plants, the combined effect was grand in the extreme—as those persons who know Orchids will readily imagine, while those who are not acquainted with their varied forms and lovely colours would not possibly be able to form any idea of the wonderful display of beauty produced by such an arrangement of such materials. We often see when there are Orchids at Flower Shows that the visitors flock around them, admiring