We have published a great many photographs, at different times, of strange and beautiful effects wrought by frost, but the annexed is so striking and peculiar that we have no hesitation in adding it to the number. In the words of the sender: "My photograph is of an enormous icicle, or one might call it a land iceberg on a small scale. The ice was formed during a recent frost by the overflow of a spring which runs from a pipe about eighteen feet from the ground into the branches of a tree. In the full sunlight it was a very pretty and novel sight."--Mr. Chas. W. Chilton, 17, West Gate, Sleaford, Lines. WHEN IS A PLATE NOT A PLATE? [Illustration] "The accompanying photographs are of a kitchen dinner-plate, which, as I discovered by chance, consists of two distinct pieces held together merely by their peculiar conformation. There is enough spring in the outer piece to enable the parts to be separated, which has been repeatedly done; but when they are reunited the whole will easily pass for a slightly cracked plate. From the colour of the fracture it is evident that the plate was in use in its present condition for at least some weeks."--Mr. S. B. Whanker, 62, Acre Lane, Brixton, S.W. AN OYSTER IN THE KETTLE. [Illustration] "Here is the photo. of an oyster-shell which has been in a tea-kettle for seven years. When I put it in it weighed about one and a half ounces, and was not more than three thirty-seconds of an inch thick in any part. Now it is three-quarters of an inch thick and weighs eleven ounces. It had lain out in the garden for a long time and lost all the crust, which accounted for it being so thin at first. No one has ever been able to say what it is, although many have seen it in the glass case in the shop."--Mr. R. G. Foster, Post Office Drug Stores, High Street, Burford, Oxon. A GEOGRAPHICAL POST-CARD. [Illustration] "This curious post-card was delivered to me in Richmond thirty-eight hours after being posted in Lausanne. No other clue was given as to the intended destination than that afforded by the physical peculiarities of the 'map' itself--the address on the side of the card being written during transmission. The full address as shown on the 'map' is as follows, and is that of yours faithfully: 'To Edward H. W. Wingfield King, Esq., 5, Spring Terrace, Richmond-on-Thames, Angleterre.'" This is, perhaps, the most curious post-card of the many which we have published, and which does the Post Office the most credit. ELECTRIC LAMPS AND PLANT LIFE. [Illustration]