COMPOSITION OF AMMONIUM AMALGAM. 



177 



apparently, in accordance with Mariotte's law. He em- 

 ployed simply a glass tube fitted with a plunger, and did 

 not measure the pressures or volumes. His conclusions 

 were that the amalgam is a mechanical or physical mix- 

 ture of liquid mercury with the gases ammonia and hydro- 

 gen, and that its semifluid consistence is due to the mixture 

 having the nature of a froth. 



The following table contains the results I obtained on 

 submitting the compressibility of the amalgam to the test 

 of direct measurement. 





Volume 

 of of 



Atmo- 



Volume 



The 



Observed 



Calculated 



No. 



spheric 



of 



increased 



volume of 



volume of 



pressure 



amalgam 



pressure 



amalgam 



amalgam 



expt 

 rime] 



h mevcury 

 it. in the 

 amalgam. 



in centi- 



under at- 



in centi- 



under 



under 



metres of 



mospheric 



metres of 



increased 



increased 





mercury. 



pressure. 



mercury. 



pressure. 



pressure. 





cub. cent. 





cub. cent. 





cub. cent. 



cub. cent. 



6 



H'S 



76*2 



21*0 



152-4 



180 



179 



7 



ii-9 



76-8 



23-0 



188-2 



*7'5 



17-1 



8 



119 



76-8 



22"7 



200'9 



17*0 



16-4 



9 



24-4 



76*2 



36-2 



152-4 



316 



3°-9 



IO 



24-4 



76-2 



31-6 



152-4 



28-0 



27-4 



ii 



13-2 



76-2 



287 



!5 2, 4 



23-0 



216 



12 



13-2 



76-2 



22*5 



152-4 



i8-5 



17-2 



13 



10-4 



76*2 



18-0 



186-3 



14-7 



13-7 



14 



10-4 



76-2 



16*0 



186-3 



12-8 



128 



IS 



23-8 



76-2 



40-4 



1787 



33*6 



31*9 



16 



23-8 



76^2 



42*0 



176-1 



33* 6 



32-7 



17 



23-8 



76*2 



42-8 



152-6 



35"o 



34-7 



18 



23-8 



76-2 



40-4 



i77'4 



33*3 



3i-9 



l 9 



23-8 



76*2 



42*2 



I02*6 



38-8 



33-5 



20 



238 



76*2 



42*2 



153-6 



34'° 



34*o 



21 



23-8 



76*2 



42-2 



J 77'4 



33'° 



32-7 



22 



23-8 



76*2 



42-0 



201-5 



32-2 



31-6 



23 



23-8 



76*2 



40-2 



177-4 



32-2 



32-1 



24 



23-8 



76*2 



40-6 



201-5 



31-2 



30-6 



25 



23-8 



76-2 



36-2 



H9'5 



32-6 



30-6 



26 



29 - 2 



76*2 



42-0 



I77-4 



3 6-8 



35*4 



27 



29*2 



76*2 



42-0 



200 - 2 



36-2 



34*7 



28 



29'2 



76-2 



40-6 



173-6 



36-0 



347 



29 



29*2 



76*2 



39'5 



I989 



34'4 



33-4 



3° 



24"6 



76-2 



32-0 



r 55'9 



29-7 



28-4 



3 1 



24-6 



76*2 



34'° 



177-4 



3°'4 



28-7 



I subjected the electrically formed amalgam to pres- 

 sure in a glass tube 48 centims. long and 1-3 centim. in 

 diameter. The pressure was applied by connecting the 



SER. III. VOL. V. N 



