416 Dr. H. Herwig on the Expansion 



The proportions here are exactly the same as with sulphide of 

 carbon. The following Table XXV. corresponds to Table XX. 

 (for sulphide of carbon). 



Table XXV. 



Limits of pressure. 



Limits of tempe- 

 rature. 



100 1OA0 

 <p At 



millims. 







370- 427 



42-9-90 



+ 015 



( „ - 415 



„ -79-8 



+0-12) 



765- 833 



63 -91 



+0-29 



( „ - 777 



„ -68-1 



+ 0-25) 



1158-1228 



75-4-94-9 



+0-2 



(1160- „ 



75-9- „ 



+0-09) 



1767-1801 



91-6-98 



+0-4 



With respect to the variation shown by the two numbers 

 taken from Table XXIII., the remark there made in the column 

 " H corrected " may serve to explain it. 



Things assume a different form with alcohol ; for here pheno- 

 mena of adhesion are very distinctly recognizable. For example, 

 the following are the numbers, arranged in the order of time, of 

 one series of observations, together with the notes taken from 

 my journal : — 



Table XXVI. 



t. 



H. 



98-5 

 95-8 



millims. 

 -2-65 

 -2-85 



At 95°, on the alcohol side a very feeble breath seems 

 already to form on the glass, of condensed particles of vapour. 





millims. 



929 



-315 



90 



-3-65 



88-2 



— 7-1 decidedly saturated. 



901 



-3-55 



93-2 



-3-25 



During the heating from 90°*1 to 93 0, 2 a narrow dull ring is 

 seen to have formed round the uppermost layers of the mercury 

 on the alcohol side, proceeding from vapour-particles precipi- 

 tated during the previous cooling from 95° to 90°, which are 

 still retained. During the continued heating, gradually larger 

 vesicles of vapour are seen to form there, consequently below 

 the level of the mercury. 



