EFFECTS OF RADIOACTIVE AIR ON GROWTH 



"49 



emanation, but with the emanation delivered at a greater distance 

 from the seeds than was the case in the preceding experiments, the 

 following experiment was made. 



May 27, 5 130 P. M. 



Dry seeds of timothy grass were sown on the surface of the soil 



Fig. 30. Experiment 42. Apparatus for growing Plants in an Atmosphere con- 

 taining Radium Emanation. The Air, after passing over the Radium Coating on 

 the inner Surface of the hollow Cylinder (/?), is delivered over the Cultures through 

 a glass Funnel. Control Apparatus at the right. Cf. figure 28. 



