5^ 



them to the bottom with screws so that the grooves will exactly 

 match. Partially fill the grooves with soft putty, or better, aquarium 

 cement, and press into each side a pane of glass. 15y making the 

 bottom board 1 1 i, inches long, an ordinary 10x12 window pane 

 will be the proper size. When the glass is pressed to the bottom 

 of the groove, draw the two ends in at the top until the glass is 

 held firmly and then fasten them in place by narrow strips of wood, 



t 



I 

 I 



s: 



<u 



I 







-/3i 

 ■//i' 



Jj \'^'- MOTH or THICK ^^. 



SECT/ON ON UNE A-B 



Fig. 5. — Working drawings for making box shotvn in figure. 4. 



one on each side of the tank, placed on top of the glass and screwed 

 to the end pieces. These strips also protect the hands from injury 

 while working with the specimens in the aquarium. Before filling 

 with water, the inner surface of the bottom and ends should be well 

 rubbed with oil or paraffine and the grooves inside the glass well 

 packed with putty." 



Some boy who loves tools and likes better to do things than to 

 read about them will take more interest in the aquarium and jts^ 



