Prof. T. Carnelley on the Periodic Law. 

 Table III. — Illustrating Eelations 2 and 3. 



263 





Methides. 



Ethides. 



a-PROPIDES. 



a-BUTIDES. 



Phenides. 



B.P. 



Sp. gr. 



B.P. 



Sp. gr. 



B.P. 



Sp. gr. 



B.P. 



Sp. gr. 



M.P. 



B.P. 



Sp. gr. 



1*129 



1-502 

 1-640 



01 ... 

 Br ... 

 I 



249 



277 

 317 



1664 



2-264 



285 

 312 

 345 



•925 

 1-468 

 1-944 



319 

 344 

 375 



•896 

 1-388 

 1-747 



351 

 373 

 403 



•887 

 1-299 

 1-580 



233 

 b. 253 

 b.255 



404 



427 

 461 



Si 



Sn ... 

 Pb ... 



303 

 351 

 433 



1-314 

 2-034 



425 

 454 

 473 



•766 

 1-187 



1-585 



486 

 498 



•762 

 1-179 







501 



633 





Zn ... 

 Hg... 



319 

 367 



1-386 

 3-069 



391 

 432 



1-182 

 2-444 



432 

 464 



1-098 

 2124 



461 

 479 



1-835 



393 



a. 573 





P 



As ... 

 Sb ... 

 Bi ... 



314 



b.373 



354 



1-523 



401 

 432 

 432 



•812 

 1-151 

 1-324 

 1-820 

















S 



Se ... 

 Te ... 



310 

 331 

 355 



•845 



364 



381 



b.373(?) 



•837 

















Relation 4. The differences between the boiling-points {and 

 also betiveen the specific gravities) of the methides and ethides, 

 of the ethides and propides, of the propides and butides, 8fc, 

 increase algebraically from the beginning of each series up to the 

 fourth or middle {tetrad) member and then diminish to the 

 seventh or last member. (See Table IV., which gives the avail- 

 able data for the Second Series.) 



Table IV. — Diff. of Boiling-points. Illustrating Relation 4. 



Diff. in atomic weight 

 of alkyl radicals. . . . 



Ethide 



minus 



Methide. 



Propide 

 minus 

 Ethide. 



Butide 



minus 



Propide. 



Propide 



minus 



Methide. 



Butide 

 minus 

 Ethide. 



Butide 



minus 



Methide 



~42~~" 





14 





2 



3 





Na 



65 



122 



87 



54 



36 



56 

 61 



41 

 34 



"50* 

 32 



120 

 183 



"95 

 70 



91 



66 



145 

 102 



Mff 



XT - L 6 



Al 



Si 



P 



S 



01 







Relation 5. The differences referred to in (4) increase on 

 the average in nearly the same proportion as the difference 

 between the atomic weights of the alkyl radicals (see Table V.) ; 

 whilst in the case where the difference betiveen the atomic iveights 

 of the alkyl radicals is the same, the difference between the boiling- 

 points either tends to become equal, or diminishes as the atomic 

 weights of the alkyl radicals increase (see Table IV. ; also com- 

 pare Kopp's Law of the Boiling-points of Homologous Series). 



