Volume Changes attendino Mixture. 497 



and which was 9*1820 cubic centim. The bulb was now kept 

 for an hour at each o, 5 higher temperature. In the follow- 

 ing Table the rise in millimetres for every 0°*5 is given ; such 

 rise being corrected for the calibration of the tube and cor- 

 rected also for the expansion of the glass (cubic expansion 

 •000026 for 1° C). The nearest tenths of millimetres only 

 are given. 



Table LVIII. 





Corrected 



Corrected 





Corrected 



Corrected 



T. 



increase 



increase on 



T. 



increase 



increase on 



on previous 



original 



on previous 



original 





volume. 



volume. 





volume. 



volume. 



o 



milliuj. 



millim. 



o 



millim. 



millim. 



161 







21-6 



18-8 



172-5 



166 



7-9 



"7-9 



221 



18-0 



190-5 



171 



7-9 



15-8 



226 



17-5 



2070 



176 



7-9 



23-7 



231 



170 



2240 



181 



8-4 



32-1 



23-6 



173 



2410 



18-6 



155 



47-6 



24-1 



17-2 



258-2 



191 



24-5 



72-1 



24-6 



172 



275-4 



19-6 



24-6 



96-7 



25-1 



172 



292-6 



20-1 



20-8 



1175 



25-6 



17-1 



309-7 



206 



18-6 



136-1 



261 



17-1 



3258 



211 



176 



153-7 



26-6 



17-1 



343-9 



The original volume at 16°*1 being 9*1820 cubic centim., 

 at, for example, 19°*1 it was 9-182 + 72*1 x '00083001*, or 

 9*2418 cubic centim. As the volumes in the third column 

 are corrected for calibre, they serve at once to explain the 

 behaviour of the liquid. 



From § 237 it seems that the liquid here dealt with is, at 

 starting, at 16°*1 a mixture of the subcryohydrate and the 

 base itself. This mixture expands regularly from 16°*1 to 

 17°* 6. Through that range equal increments of temperature 

 are accompanied by equal expansions. At 18°'l the liquid 

 is opalescent, and that opalescence is accompanied by an in- 

 creased expansion. At 18°* 6 the liquid becomes quite milky, 

 and on standing separates into two of nearly the same density 

 and refractive index. These two are about equal in volume (see 

 § 241 a). The two next half-degree warmings produce a still 

 greater separation ; I mean that the total actual sinking of 

 the watery solution and the rise of the ammoniacal solution is 

 probably greater in this case than before. The joint expan- 

 sion has increased. Now this may be brought about by two 

 causes : either that the separation is greater, or that after 

 separation the mean expansion by heat of the separated parts 



* From table of calibration. 



