so 



leak some day and spoil everything. But failures do not discourage 

 us; they only make us more determined. If a rectangular, water- 

 tight box is out of the question, what is the next best thing ? One of 

 the busiest laboratories in New York State has plants and animals 

 living in jars of all shapes and sizes; fruit jars, glass butter jars, candy 

 jars, battery jars, museum jars, and others of like nature. There are 

 rectangular and round aquaria of various sizes kept by all firms whv 

 deal in laboratory supplies, and if some money is to be spent, one of , 

 these is a good investment. Figure 2 shows one of these rectangular 

 ones, and figure 21 shows a round one of small size which is useful 

 and does not cost much. 



A simple home-made aquarium of glass and wood is described in 

 Jackman's " Nature Study" as follows: * " Use an inch board 11^ 



Fig. i^t'^P^manent aquarium made of wood and j;/usi 



inches wide and 1 2 inches long for the bottom, and two boards of the 

 same thickness and length, 10^ inches high for the ends. Three- 

 eighths of an inch from the edge on either side, with a saw, make a 

 groove one-quarter of an inch deep, and wide enough to receive 

 loosely double strength glass. Groove the end boards and fasten 



•"Tlie (liniensions have been changed slightly from Jackman's text. 



