452 Goodale — New Form of " Container" for Museums-, 



When the specimen is a powder which it is desired to show 

 in a thin layer, it lias been found well to proceed in a dif- 

 ferent manner. First, a flat cell is made by cementing with 

 glue the thinnest strips of wood, on all four sides, and then 

 drying the whole. Into this cell the powder can be put in a 

 perfectly even layer, and then covered carefully by the other 

 slide. 



Among the advantages which this easy method possesses are 

 the following, — economy of material, absence of distorting- 

 refractions of the container, a convenient tablet form for any 

 exhibition-case, and a free space for labelling. To these 

 advantages may be added the slighter but not unimportant 

 ones; exposure of both sides of the specimen, and security 

 against damage when used as a hand-specimen for class-work. 

 When the container is filled and finished, the whole work and 

 the materials used in construction have together cost less than 

 unsatisfactory bottles. 



Cambridge, May, 1906. 



