FORCEPS. 85 



off irregular currents of air, and thus secures a steady 

 flame. Over the burner is placed a Leblond's blue glass 

 chimney D. This corrects the colour of the flame to a 

 certain extent ; but it is still further rectified by a disc of 

 bluish-black neutral-tint glass E, fitted in a tube F, attached 

 obliquely to the shield G. G is a half- cylinder of metal, 

 which serves to shield the eyes from all extraneous light, 

 but may be rotated on the stage A by aid of the ivory 

 knot H, when the full light from the flame is desired. A 

 metallic reflector i, fixed on its supports, so as to be 

 parallel to E, concentrates the light. By the combination 

 of the two glasses D and E, the yellow rays of the flame 

 are absorbed, and the arrangement affords a soft white 

 light, which may be still further improved by receiving 

 the rays on a concave mirror, backed with plaster-of- Paris 

 L ; and where a very strong light is required, a condensing 

 lens should be interposed, as shown in the cut, between 

 the lamp and the mirror of the microscope. By removing 

 the shield G, and bringing the shade M over the burner, it 

 may be used as a reading-lamp. A retort ring N supports 

 a water-bath o, or a wrought- iron plate P, 6 inches by 2| 

 inches, both used in mounting objects. The stop-cock Q 

 gives the means of regulating the flame. The screw R 

 clamps the lamp-head at any height desired. The lamp 

 may be attached to any gas-supply by vulcanised India- 

 rubber tubing. Price, complete, thirty-five shillings. 



Forceps. For holding minute objects, such as parts of 

 plants or insects, to be examined either as transparent or 

 opaque objects, the most useful is represented by fig. 49, 



Fig. 49. 



and consists of a piece of steel wire, about three inches 

 long, which slides through a small tube, connected to a 

 stout pin by means of a cradle-joint ; to one end of the 

 wire is attached a pair of blades, fitting closely together 

 by their own elasticity, but which, for the reception of any 



