506 



Frederick Guthrie on some Thermal and 



which the expansion or contraction took place being there- 

 fore 6*7554 c. c. The mean volume of 1 millim. of the capil- 

 lary tube about /was 0*00140183 c. c; so that 1 millim. on 

 the capillary meant 0-00020737 of the joint liquid volumes. 

 As the readings could be made by means of a cathetometer* to 

 within 0*2 millim., I imagine that the numerical results are 

 strict to the fifth decimal place. The only other sources of 

 error appear to be the mixing of the liquids during the filling 

 of the upper bulb and capillary. The filling of both bulbs is 

 effected by means of a funnel-capillary, which reaches about 

 half way down into the bulb which has to be filled. Acci- 

 dental soiling of the tube is removed by a thin German-silver 

 cotton-covered wire. 



In the following Table equal volumes at 17°*6 of the liquids 

 enumerated were taken. There is in every case an expansion 

 marked +, or a contraction marked — . Before these signs 

 is H, C, or according as heat is liberated or absorbed. Imme- 

 diately beneath these signs is the amount of contraction upon 

 one volume of the original liquids taken jointly (before mix- 

 ture). Below these is the temperature to which the altered 

 volume has to be brought in order to restore it to the original 

 (joint) volume. 



Table LXI. 

 Equal Volumes at 17° a 6. 





Alcohol. 



Ether. 



Bisulphide 

 of Carbon. 



Amylene. 



Chloroform. 



Benzol. 



Alcohol 



■ 



H- 



•006894 

 23°-5 



C+ 



•007278 



11° 



? 



H- 



•002488 

 19°-75 



c+ 



•0002488 

 17°-42 



Ether 





• 1 



•001556 

 16°-5 



H- 



•0004977 

 18°1 



H- 



•0108869 

 25°-8 



H- 



•00346308 

 20° -4 





Bisulphide of 

 Carbon 



} 





• ( 



c+ 



•00311055 

 15°-05 



C4- 

 •00688468 

 ll°-7 



C4- 



•0069469 



11°-1 



Amylene . . . 









1 



H- 



•0015138 

 19°1 



0+ 



•0010783 



16°-6 



Chloroform . 











• ( 



C+ 

 •0018396S 

 15°9 



Benzol 

















The experimental errors appear here to be entirely due to 

 Designed and made by the "Cambridge Scientific Instrument Company." 



