310 I)r. Gr. Gore on Changes of Temperature caused 



Table I. 



Experi- 







Experi- 





ment. 





Cent. 



ment. 



Cent. 





Na 2 C0 3 



Degree. 

 ... -04 





Degree. 

 AmCl -30 



1. 



30. 



2. 



NiS0 4 , 



... -10 



31. 



]N T a 2 HP0 4 (5-0 per cent.) '30 



3. 



NaHC0 3 



... 12 



32. 



KHS0 4 -30 



4. 



SrCl, 



... '12 



33. 



SrCl (20-0 per cent.) ... '30 



5. 



BaCl 2 



... -13 



34. 





6. 



MnS0 4 



... -14 



35. 



NaCl '32 



7. 



Na 9 S0 4 



... -15 



36. 



FeCl 2 -33 



8. 



MgS0 4 



... -15 



37. 



HN0 3 -34 



9. 



KC10 3 (5-0 per cent.) 15 



38. 



K 2 C0 3 -36 



10. 



Ca01 2 



... -18 



39. 



KBr -37 



11. 



AmN0 3 



... -18 



40. 





12. 





... -18 



41. 



FeS0 4 '38 



13. 



HIO3 



... -19 



42. 



KBr (Note "A") -38 



14. 



ZnCl 2 



... -20 



43. 



MnCl 2 '39 



15. 



Or0 3 



... -21 



44. 



ZnS0 4 -41 



16. 



K 2 S0 4 



... '22 



45. 



MgCl 2 -41 



17. 



CoS0 4 



.. -23 



46. 



CdCl 2 -41 



18. 





•24 



47. 



H 2 S0 4 -42 



19. 



NaBr 



.. -24 



48. 



H 3 P0 4 -44 



20. 



Am Q S0 4 



... -24 



49. 



KHC0 3 ... -44 



21. 



CuS0 4 , 



... -25 



50. 



H 4 P 2 7 -47 



22. 



Citric Acid 



.. -25 



51. 



HC1 -48 



23. 



KI 



.. -26 



52. 



KCy (1*25 per cent.) -60 



24. 



KN0 3 



.. -26 



53. 



KCy(2'5 „ „ ) -67 



25. 



HBr 



.. -26 



54. 



KCy (5-0 „ „ ) -70 



26. 



LiCl 



.. -28 



55. 



NaCy -72 



27. 



Sr01 2 (5'0 per cent.) 



.. -28 



56. 



CdS0 4 -78 



28. 



Co01 2 



.. -29 



57. 



KCy -82 



29. 



KIQ 3 (5-0 per cent.) 



.. -29 



58. 



AmHO 1-40 



Note "A," exp. 42. — In this case the silica was exposed in an uncovered 

 vessel to the air during sixteen hours, but this had only a minute influence 

 upon the amount of rise of temperature (compare with No. 39). 



Remarks. — In every one of the instances of Table I, a rise 

 of temperature occurred; as, however, water alone gave a 

 rise and was used as the solvent in all cases, this circumstance 

 may explain that uniformity of result. Whilst many of the 

 solutions gave larger rises than water, quite as many gave 

 smaller ones ; and we may regard all those which gave 

 smaller ones as containing substances which absorbed heat 

 and diminished the rise, whilst those which gave larger ones 

 evolved heat and added to the amount of rise produced by 

 water alone. Probably by further research some substances 

 may be found which will more than neutralize the temperature- 

 effect of the water and give negative numbers. 



The series of results obtained with potassium cyanide in 

 exps. 52, 53, 54, and 57 show that the magnitude of rise of 



