Boiling-point as related to Chemical Composition. 177 

 x. y. y calc. 



10 -32 -31-24 



12 12 11-38 



14 + 4-5 + 4-37 



16 18 17-16 



18 28 27-75 



20 36-7 36-67 



22 44-4 44-28 



24 51-1 50-86 



oc 140-56 



Sum of the errors, —'23; probable error of a single compa- 

 rison, "34. The two curves are very near to each other at 

 0° C; but they slowly diverge as the value of x increases. 



9. Ketones. — The equation to the odd series, deduced from 

 all the experiments, is 





9-996(a?-9-61) 





y ~ \ + -073764(^-9-61)" 



X. 



y (Kraffts). y calc. 



11 



13 12-60 



13 



28 27-11 



15 



39 38-55 



17 



48 47-81 



19 



55-5 55-45 



23 



69 67-34 



27 



72-3 76-15 



31 



82-8 82-94 



35 



88-4 88-34 



oc 



135-51 



Sum of the errors, +'29; probable error of a single compa- 

 rison, 1*03. In like manner, the equation to the even series is 



8-750-11-48) 





* 1 + -061880O- 



-11 



•48)' 



X. 



y(Kraffts). 





y calc. 



12 



4 





4-41 



14 



19 





19-08 



16 



31 





30-91 



18 



41 





40-65 



oc 



• •• 





141-40 



Sum of the errors, -h'09; probable error of a single compa- 

 rison, *21. 



10. Ketates. — These members of the acetic group appear to 

 form at least four series, two of which are even and two odd. 



Phil. Mag. S. 5. Vol. 17. No. 105. March 1884. N 



