EXPOSED WATER AND FRESHLY FALLEN RAIN 



159 



of the other two. On April 17 measurements of the heights of the 

 seedHngs were recorded as follows : 



The relative heights of the plants in the three cultures remained 

 as above until April 24, when observations were discontinued. 



Lupine {Lufinus albus) 



On April 14, none of the control plants were up, but in the other 



two cultures some of the seedlings were just breaking the surface of 



the soil. On April 16 seedlings were up in all of the pots, but there 



was no appreciable difference in their height or in any other character. 







2 



S 4 5 6 T 8 



Days 



Fig. 34. Effect on the Germination and Growth of Oat of soaking the Grains in Water 

 exposed for 26.5 Hours, to Rays from Radium of different degrees of activity. 



On April 23 the average height of the seedlings of the 1,500,000 

 culture was 26.10 mm., of the 10,000 culture 25.38 mm., and of the 



