THE 



AUTO-IRRIGATOR 



A BOON TO EVERY GROWER 

 OF POTTED PLANTS 



T 



iHE Auto-Irrigator is a simple device 

 for placing water in the soil of pots 

 in quantities as needed. Is abolishes 

 the watering nuisance, and maintains a 

 practically constant soil moisture, at any 

 amount from saturation nearly to dryness, 

 according to the adjustment of the instru- 

 ment. It requires attention only two or 

 three times a month, and its use results in 

 a great improvement of plant growth as 

 compared with sporadic surface watering. 

 The essential feature of the Auto-Irrigator is a porous clay cup 

 such as is used in the Atmometer. Its installation requires the use of a 

 stopper, tubing, and a vessel to contain the water supply. The degree 

 of soil moisture maintained is determined by the height of the reservoir 

 in relation to the pot. The length of time during which the apparatus 

 may go without attention depends chiefly on the size of the reservoir. It 

 may be used in pairs or in groups, and operates equally well in pots, in 

 benches, or in outdoor beds. Full instructions for installing and oper- 

 ating will be furnished on request or with orders. 



For further information regarding the use of the Auto-Irrigator see: 



Plant World, Vol. 11, pp. 39-40, February. 1908. 

 Plant World, Vol. 13, pp. 220-227, September, 1910. 



New Cups for Auto-Irrigator: 



$.50 each, $4.00 per 10. 



Seconds (cups which have already seen use as atmometers): 

 $.35 each, $3.00 per 10. 



THE PLANT WORLD 



Tucson, Arizona 



