126 REVIEWS. 



could cure the disease in aquaria. He gave an instance of a fish 

 being cured in an aquarium. The disease spread quickly ; he had 

 seen a clean fish go among diseased fish, and in two or three days 

 it began to show the disease. 



Mr. Brown said that the disease appears not only upon other 

 kinds of fish, but also upon insects. One appearance Dr. Lediard 

 had omitted to mention which was very common in this disease 

 and that was haemorrhage in the muscles ; and he had no doubt 

 that if this fish on the table were cut up they would find in its 

 muscles large collections of blood. 



After remarks by other Members, the meeting separated. 



1Rcview0* 



The Gentleman's Magazine for January contains a very 

 interesting paper on the " Garden-Snail," from which we make the 

 following extract : — 



" The snail who has arrived at the adult condition must have 

 done so, of course, by eating food ; and the way he performs this 

 necessary operation is really very curious and remarkable. Every- 

 body who has seen a cabbage-leaf off which a snail has been 

 making his simple and inexpensive breakfast must have noticed 

 that its edges are quite cleanly and neatly cut, as if by a knife or a 

 pair of scissors. That suggests to one at once the idea that the 

 snail must be possessed of a sharp and eftective cutting instru- 

 ment. And so indeed he is, for he has a keen, horny, upper jaw, 

 which closes upon a very remarkable saw-like organ below, com- 

 monly called the tongue or dental ribbon. This tongue is a long, 

 muscular, and cartilaginous strip, like a piece of narrow tape, 

 armed all over with an immense number of little teeth or curved 

 hooks, for tearing and masticating the food. It is coiled up 

 inside the mouth, and only a small portion of it is brought into 

 use at any given time ; as fast as the hooks on one part are worn 

 out, another part is unrolled from behind, and made to take its 

 place in front for the purpose of feeding. The little teeth, of 

 which there are several thousands — the slug, for example, has i6o 

 rows, with i8o teeth in each row — are formed of silica or flint, 

 and cannot be dissolved, even in acid. They are coloured hke 

 amber under the microscope, and form most beautiful translucent 



