ERS. - A simple means of temporarily changing the oolors of natural flowers is by immersing the sterns in liquid ammonia. In this way blue, violet, and purplo flowers are changed to green, and white ones to yellow. The natural color returns in a few hours. Another iuteresting process, of which flowers also form the subject, was recently brought to the notice of the Society of Arts. It is a method for coating natural flowers, as well as leaves, with silver, by the application of electro-metallurgy ; in other words, simply electro-plating them. The most delicate ornamonts can thus be obtained, preserving with exquisite detail the outline and form of each leaf and petal.