150 



THE 8TKUCTUBE OF THE NOCLEDS. 



Cunsidered as a whoU', tliese data coutaiii no evidence of a decreasing rate, but 

 rather point to an initial position of tbe plane of demarcation between 5 and !(• cm. 

 This interpretation will be accepted as thei'e is none more prol)able. 



12. Acetoiw. — The data for this reagent ai-e the most irregular of the whole 

 series of results, if the longer intervals of 100 min. are included. Helow 100 min. 

 a graph, figure 5, which points to an initial plane at about 5 cm. may be accepted. 

 The anomalous results marked h in figui-es 4 and 6 are due to acetone. 



TABLE 5.— DIFFUSION. ACETONE. EXHAUSTION, 76-62.6001. PHOSPHORUS 

 NUCLEI. ONE OR MORE EXHAUSTIONS BETWEEN OBSERVATIONS. FRESH 

 NUCLE.VTION AT EACH INFLUX. 



' Veil 20-25 cm. high. 



' Probably influenced by convection. 



13. Amyl alcoliol. — Much time was spent with this body but only a few 

 trustworthy results were obtained. The presence of mei'e traces of moisture 

 invariably provoked a collapse of the whole column on exhaustion. It was 

 necessary to inti-oduce the alcohol, after being dehydrated with caustic lime, in a 

 paste of the lattei' substance. Collapse invariably occurred on second exhaustion, 

 for which reason no attempt was made to depi'ess the initial plane of demarcation. 

 It is possible that the molecules of amyl alcohol are efficient nuclei for water vapor, 

 but at the present stage of research it is difficult t<> assign a i-esison foi' the behavior 

 specified. Cf. figure 6. 



