120 



THE STRUCrriTRK OK THE NOCLEUS. 



When a volume of L'OOU cub. cm. is shaken (4 times the usual bulk), the 

 number of nuclei is increased about 2.4 times. The nucleation here does not keep 

 pace with the bulk — a circumstance which is in a measure e.xplained because the 

 lar^e volume fills too much of the receiver and interferes with efficient .^^haking. 

 It is well to note, however, that it is from experiments of this kind that the true 

 relation of the absorption velocity, l\ to the nucleation, v, is to be learned. 



-2 -J -S -Z ^J 1 



Fli-.S. 12-13.— NlJMRKR '•►' TARTICLES «, AND IIIFIK ABSORPTION VELOCITY, *, GENERATEIi BY SHAKING SO- 

 LUTIONS OK Different Solutes and of Different Logarithmic Concentrations (log <-.). 



20. Ftrric nitrate. Concevtralion, snipcr^atiiroliov. — The normal number <if 

 nuclei produced is 175 for the larger and 101 for the smaller concentration, the 

 dilution being 1/10. (/. table G. The difference lies below the limits of error. 

 Of. figure 12. 



The effect of pressure decrement is also indecisive, ami all nuclei are preci[)i- 

 tated for i>ressure decrements of le.ss than 4 cm. 



21. Tiint' Aa^.svs-. — The time ciiefiicients for the two concentrations are not 

 appreciably different. Dilutions of the order stated are thus negligible so far as 

 the present method goes. 



