CEMENT AQUARIA 



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Fig. 3. Device for aerating aquaria, c, wooden cylinder inserted into metal 

 connections through which air is forced under pressure. 



long, thousands of very minute bubbles are secured, giving excel- 

 lent aeration. We use sections of dowels securely fastened in 

 brass iron pipes in such a way that the air is forced through the 

 cells or ducts (see fig. 3). Some woods we have found to be 

 very much better than others for this purpose. 



In our estimation these home-made aquaria are as satisfac- 

 tory, as the manufactured article, if not more so, and are cer- 

 tainly very much cheaper. 



