PERSISTENCE ON SOLUTION. 



6l 



TABLE 37. Showing that fleeting nuclei become stable on solution. Rectangular 

 wooden fog chamber in lead casket. 5 / = 25 cm. Exposure to X-rays, 3 sec. 

 Distance of X-ray bulb, 200 cm. Mere rain denoted by r. 



Part I. 



Part II. 



Part III. 



Part IV. Cylindrical glass fog chamber. 



= io cm. 



Part V. 



* Representing about 3,000 nuclei due to nonenergized, dust-free air. 



f Persistence tested but not found (2-minute exposure, i-minute lapse, 5 = i.o). 



