Boiling-point as related to Chemical Composition. 181 



X. 



y- 





y calc. 



4 



0°-4° 





2-35 



6 



70-6 





70-68 



8 



124 





124-00 



12 



202 





201-80 



oc 







555-67 



The equation for the odd series, 



deduced from # = 5, 7, 11, is 





38-992 



(x- 



-3-92) 



* 1 + '070564 (#-3\)2)' 

 whence the corresponding boiling-points 39'13 ; 98*66, 184*09. 

 When #= oc,y = 552*58. The close correspondence in this 

 case between the odd and even series is extremely remarkable. 

 According to the equation, marsh-gas would boil at —143*41. 

 Kraft'ts has given an extended list, of determinations under 

 15 millims pressure, the reduction of which leads to very 

 interesting results. 



The even series has the equation (calculated from all the 

 determinations) 23*154 Q-7-1) 



y "~ 1 + -035484 O-7-l) ; 

 x. y. y calc. 



12 98 96-65 



14 129-5 128-34 



16 157-5 156-61 



18 181-5 181-99 



20 205 204-89 



22 224-5 225-66 



24 243 244-61 



oc 652-52 



Sum of the errors, — -25; probable error of a single compa- 

 rison, *79. 



The equation for the odd series, chiefly calculated from 



ar=ll, 21,31, is 



21-685 0-6 



•77) 



y- 



1 + -030437 (x- 



-6-77) ' 



X. 



y- 



y calc. 



11 



81 



81-27 



13 



114 



113-57 



15 



144 



142-72 



17 



170 



169-17 



19 



193 



193-27 



21 



215 



215-32 



23 



234 



235-58 



27 



270 



271-51 



31 



302 



302-41 



35 



331 



329-26 



oc 





712-46 



