ON MOUNTING OBJECTS. 



107 



way, and during the drying process, after maceration, 

 which facilitates removal of objects from time to time, for 

 the purpose of examining them. It is made of two strips 

 of whalebone three or four inches in length, held together 

 at each end with square pieces of brass ; these can be 



moved at pleasure towards the centre, and thus made to 

 exert considerable pressure upon the pieces of glass and 

 the object, which are placed crossways between the strips 

 of whalebone. The small spring-nip sold under the name 

 of the American clothes-peg, when filed down, makes an 

 excellent holder. 



LIE 



TrmmirmTmiinnmniu.u 



Fig. 74.Air-Pump. 



For the purpose of more effectually removing bubbles 

 of air from the cells before the objects are cemented down, 



