order to get the required speed of drip. The height of E above the 

 thistle should be about 1^" to 2". When properly positioned the 

 drop traps the air slug with a characteristic bop. Unless the drops 

 fall squarely the water will run directly down the tube into K 

 without pumping air. Occasional adjustments are found to be neces- 

 sary as the plug swells or becomes foul. 



As described, the apparatus will use about a gallon of water a 

 day. The writer siphons the overflow in T night and morning and 

 replaces it in A. Occasionally an additional half-pint is added to 

 make up for evaporation. 



The equipment should be run for several hours before placing 

 the plants in the nutrient solution. 



The device was set going in September and the specimens re- 

 mained in the water in which it was collected, with slight additions 

 of tap water to make up for evaporation. At the end of four months 

 the specimen was fresh, and there was no accumulation of bacterial 

 scum. The water was then replaced with Detmer's solution, con- 

 centration 6 per 10,000, and now (February) the plant is showing 

 growth. 



The writer contemplates setting up a battery of these aerating 

 devices in which water directly from the tap will be used by passing 

 it through a header having small branches and stop cocks and using 

 drig plugs of glass or plastic material. The present "tees" will be 

 replaced with some having much larger diameter so that the change 

 of sectional area will ensure every water slug being broken. The 

 flasks (K) will overflow directly into a drain. Such an outfit should 

 require practically no attention. 



Staten Island Institute 

 OF Arts and Sciences, N. Y. 



FIELD TRIPS OF THE CLUB 



Trip of July 5-7, 1940, to the Pennsylvania State College 

 Nature Camp, Seven Sister Mountains, Pa. 



Upon arrival at the camp in the midst of a forest preserve, 

 the seven members and guests were cordially greeted by Prof. 

 George R. Green, Director of the Nature Camp, and his staff. Miss 

 Farida A. Wiley, Dr. Oliver P. Medsger and Prof. George J. Free. 



