86 THE STEUOTURE OF THE NTTOLEUB. 



TABLE II.— PROPERTIES OF NUCLEI IN VAPOR OF CARBON BISULPHIDE. 

 EXHAUSTION, 76-58 cm. AIR NUCLEI. 



lOxliaustion Nu. 



Corona. 



Strong irregular campanulate corona 

 Quarter corona 

 Eighth corona 

 Nearly absent 



Here, as al)Ove, all nuclei in vapoi- of carbon di.siilpliide form a lieav}' stratum. 

 C'onileusatiou seems to occur spontaueouslj^ without supersatuiation, ami the invisi- 

 ble stratum of loaded nuclei at once seeks its density level, where it is found on 

 exhaustion. 



25. Shalc£n nnclei. — In contrast with this erratic behavior, the effects of 

 shaking and the .spontaneous generation of nuclei is particularly regulai'. Shaking 

 heats the li(iuid, and a corona is liable to occur on the resulting efllii.v of vai)or. 

 This disturbance must be guarded against. The following table is a summary of 

 ob.servations with coronas due to nuclei obtained by vigorously shaking the liipiid. 

 Intense fogs are usually apparent on exhaustion. 



TABLE 12.— NUCLEI IN VAPOR OF CARBON DISULPHIDE DUE TO SHAKING 

 THE LIQUID. EXHAUSTION, 76-58 cm. DIAMETER OF VESSEL, 23 cm. 



In the fii'st series the nuclei were easily removed ; but this was not the case later, 

 priiliably Ijecau.se the re-agent, after continued distillation, had concentrated the 

 imituiities. The semi-annidar, rpiarter, and other coi'onas are indicative of an 

 almost sudden passage from nucleated to pure air at the surface of demarcation. 



