THE PRESERVATION OF SPECIMENS. 



307 



edge farthest from this groove make another groove 

 fitted to receive a piece of glass, which is to form the 

 top of the case ; and on the same side of the wider 

 piece at the edge farthest from the tongue cut a rab- 

 bet three eighths of an inch deep ; this is to receive 

 , ,. the board that is to form the bot- 



tom of the case. Fig. 274 repre- 

 sents a cross section of the strips of 

 i wood thus prepared, and will serve 

 as a working drawing for the car- 

 penter or cabinet maker. 



From these strips the sides of 

 the case are to be made. The 

 tongue and groove should fit snug- 

 ly, so that pests can not enter the 



-V 



PT 



*v 



fr /^ 



FIG. 274. 



FIG. 275. 



FIG. 276. 



case when it is closed, and the corners of the case 

 should be very carefully mitered (Fig. 275). 



The corners should be both glued and nailed. As 

 soon as the case is put together, and before the glue 

 hardens, the top and bottom should be slightly sepa- 



