oc 



182 Dr. E. J. Mills on Melting-point and 



Sum of the errors, +'08; probable error of a single com- 

 parison, -74. 



As diminished pressure increases stability, the values of y 

 in these two latter series are naturally greater than those ob- 

 tained from the two former under ordinary or atmospheric 

 pressure. It is interesting also to note, as regards the value 

 of y a in the two latter series, that they differ by a quantity 

 nearly identical with what will hereafter be termed the 

 " modulus of boiling-point." 



17. Alcohols. — For the even series, the equation has been 

 calculated from #==2, 6, and 10. In the table, values are 

 inserted for # = 4 and 8 for the purpose of future reference ; 

 but the only know^n corresponding normal alcohols boil at 

 116*88 and 196*5 respectively. 



_ "31-813 Qg+ -875) 

 y ~l + -057806 (a? + ;875)' 



x. y. y calc. 



2 78-53 78-50 



4 120-99 



6 156-60 156-51 



8 186-60 



10 212-50 212-43 



oc 550-34 



The equation for the odd series has been deduced from x = 3, 

 5, 7, and 9. 



_ 30-177 (a + -83) 

 y " 1 + -048897 i> + -83)' 



r. y. y calc. 



3 97-41 97-35 



5 137 136-91 



7 171 170-87 



9 200 200-34 



oc 617-15 



Sum of the errors, + -06 ; probable error of a single com- 

 parison, '15. 



For #=7, Grimshaw and Schorlemmer found y= 175-7; 

 Cross, 175°'5. Their alcohol must accordingly have been 

 isoprimary. Methylic alcohol does not belong to this series. 



18. Ketates. — The equation for the even series (calculated 

 from all determinations) is 



_ 37-262 Q + 1-82) 

 y ~~ 1 + -054832 + 1-82)' 



