88 Transactions Tennessee Academy of Science 



AN IRRIGATION SLIDE FOR PROLONGED OBSERVATION OF 

 LIVING AQUATICS 



BY SAMUEL M. BAIN, UNIVERSITY OF TENNESSEE. 



(Abstract.) 



An ordinary culture slide, with the concavity placed toward one 

 end, has a small trough scratched so as to reach the center of the 

 slide. In this groove a capillary tube is cemented, reaching to the 

 bottom of the concavity. Water placed in the latter, protected by a 

 cover glass, will supply that lost by evaporation from beneath the 

 cover glass adjoining. Illustrated by lantern. 



November 26, 1915. 



A SIMPLE DEVICE FOR AERATING AQUARIA. 



BY SAMUEL M. BAIN, UNIVERSITY OF TENNESSEE. 



(A bstract.) 



An ordinary Tantalus cup of convenient form and size has a some- 

 what smaller jar inverted within it. From the latter a tube leads the 

 air current into the top of a large-mouthed jar. From this jar the 

 air is led into the several surrounding aquaria. Into the stopper of 

 the distributing jar a tube is fixed, which dips a little below the sur- 

 face of some paraffin oil at the bottom. On running a slow current 

 of tap water into the Tantalus cup, the air is forced out of the in- 

 verted jar into the aquaria. When the siphon overflows, a current is 

 set up in the opposite direction, but the intake of air occurs through 

 the tube dipping into the paraffin oil. The device supplies an inter- 

 mittent air current, the rapidity of which can be controlled by vary- 

 ing the water supply to the cup. Illustrated by lantern. 



November 26, 1915. 



