262 



Prof. T. 



Carnelley on the 1 



D eriodic Lau 



'. 







turning-points) of Mej^er's curve of the elements {Mod. Theor. 





der Chem.), in which respect they resemble those correspond- 





ing halogen compounds of the elements which are exceptions 





to the same rule. 





The above facts are shown in the following Table : — 





Table II.— Illustrating Relations 1 and 2. 







Methides. 



Ethidbs. 



«-Pjropides. 



«-Butides. 



Phenides 



*. 



B.P. 



Sp. gp. 



B.P. 



Sp. gr. 



B.P. 



Sp. gr. 



B.P. 



Sp. gr. 



M.P. 



B.P. 



Sp.gr 



Li ... 

 Be ... 







459 





518 













B 



b. 257 





369 



•696 





















282 

















418 



a. 633 





N 



281 





362 



•728 



429 





486 



•778 



400 



a. 573 









249 





308 



•735 



357 





413 



•768 



301 



519 





F 







283 











b.253 



358 





Na ... 

























M£... 

























Al ... 



403 





467 





523 















Si ... 



303 





425 



•766 



486 



•762 







501 



633 





P 



314 





401 



•812 

















S 



310 



•845 



364 



•837 



405 



•814 



455 



•839 





565 



1-119 



01 ... 



249 





285 



•925 



319 



•896 



351 



•887 



233 



404 



1-129 



Ou ... 

 Zn ... 



319 



1-386 



391 



1-182 



432 



1-098 



461 











Ga ... 

























Eka-Si 

























As ... 



b.373 





432 



1-151 











331 



633 





Se ... 



331 





381 



















Br ... 



277 



L664 



312 



1-468 



344 



1-388 



373 



1-299 



b.253 



427 



1-502 



A S ... 























Cd ... 

























In ... 























Sn ... 



351 



1-314 



454 j 1-187 



498 



1-179 













Sb ... 



354 



1-523 



432 1-324 

















Te ... 



355 





b.373 



















I 



317 

 367 



2-264 



345 



1-944 



375 



1-747 



403 



1-580 



b. 255 



461 



1-640 



Au ... 

 Hg ... 

 Tl ... 

 Pb ... 



3069 



432 



2-444 



464 



2124 



479 



1-835 



393 



a. 573 



433 



2034 



473 



1-535 

















Bi ... 









1-820 

















The phenides of course are not comparable with the methides, ethides, &c, 

 though they appear to obey the same rules. 



Relation 2. The boiling-point increases and the specific 

 gravity diminishes as ice pass from the met hide to the eihide and 

 thence to thepropide, Imtide, 8fc. (See Tables II. and III.) 



Relation 3. The boiling-points and specific gravities of 

 the alkyl compounds of any one group increase as the atomic 

 weight of the positive element increases, (See Table III.) 



