TIME VARIATIONS OF NUCLEI. 



T 57 



Table 54, continued. Colloidal nucleation (s) of dust-free air near the fog limit in 

 their time variations, observed two or more times daily. 5p = 27 cm. (observed at fog 

 chamber, isothermally) = p - p s . Computed dp = p - p 2 = 2 1 cm. 



made at about 9 a. m. and 3 p. m., as near the time of the Wood and 

 Campbell maxima and minima as my duties permitted, on the successive 

 days and hours given by the abscissas. 



99. Deductions. Figure 64 shows in the first place that, in general, 

 minima and maxima of nucleation would have to appear at about the 

 time at which Wood and Campbell observed maxima 'and minima, 



