290 



Intelligence and Miscellaneous Articles. 



think, place its existence beyond doubt : they were determined, as 

 will be seen, at various temperatures between 6° and 28°. 



The gradual contraction does not appear to have ceased at the 

 end of the seventeen days' exposure of the bottle to 8°, nor does it 

 seem to have been affected by the temporary heating of the bottle 

 to the higher temperatures at which its contents were deter- 

 mined. 



In the last column is given the weight of the bottle itself on the 

 various dates : it shows a slight gradual decrease owing to wear ; 

 but this wear, even if it took place entirely on the inside, would 

 not be sufficient to account for a tenth part of the decrease in the 

 weight of the contents. 



Alteration in the Capacity of Grlass Bottle while being kept at 8°, 

 after it had been previously kept at 18°. Contents measured 

 at t°. 



t= 



6°. 



8°. 



10°. 



12°. 



Bottle 

 alone. 



Nov. 8 



Dec. 3 



„ 12 



„ 16 



„ 17 



25-0317 

 25-0311 



250301 



250293 

 25 0289 



25-0288 



250264 

 25-0269 



25-0245 

 25-0228 



15-7192 

 15 7188 

 15-7188 

 15-7187 

 15-7186 



t= 



14°. 



14°.* 



16°.* 



28°. 





Nov. 30 

 Dec. 3 



„ 7 

 » 17 



25-0916 

 250182 



44 4345 

 44-4309 



43-6239 

 43-6207 



24-9535 

 24-9532 

 24-9519 



15-7191 

 15-7188 

 15-7187 

 15-7186 



* The bottle contained sulphuric-acid solutions instead of water in these 

 cases. 



Just as cooling the bottle for a few degrees induces a gradual 

 contraction, so does heating it induce a gradual expansion. After 

 the contents measured at 28° had been reduced on December 7 to 

 24*9519 grams, they were found to have increased to 24-9532 

 grams by April in the following year, the bottle in the mean time 

 having been kept at the higher temperature of 12°-15°. Again : 

 on December 3, 1889, after the bottle had been exposed for some 

 time to a temperature of about 10°, its contents at 18° were found 

 to be 25-0066 grams ; it was then heated at 30°-35° for three days, 

 after which they had increased to 25*0073 grams. 



The maximum alteration in capacity noticed in any of the above 

 experiments is *0001 of the total volume, and an alteration of this 



