508 



Prof. T. Carnelley on the Periodic Law. 



member and then diminish to the seventh or last member. (See 

 Table IV.) 



Table IV. — Illustrating Relations 4 and 5. 





Br-Cl. 



I— Br. 



I— 01. 



Et— Me. 



Pr— Et. 



Pr— Me. 



D iff. in at. wts. 



44'5 



47 



91-5 



14 



14 



28 





B.P. 



B.P. 



B.P. 



B.P. 



B.P. 



B.P. 



O 



112 

 90 



158 



270 



114* 







(OH)* 



(0H a )«i 



55 



83 



i38 



66 



60 



i*26 



(0H 3 )i 



28 



39 



66 





29 







(C 3 H)i 















(0 8 H 2 )« 















(C 3 H 3 )-...... 



55 















(0 3 H 4 )iv 



66 













(0 3 H 6 F 



61 













(0 3 H 6 )" ...... 



45 



42 



94 



60 



51 



iii 



(0 3 H 7 )i 



24 



29 



53 



37 



33 



70 



The number of cases in which Relation 4 can be applied is 

 unfortunately very limited ; but, in so far as it is applicable, 

 the data obey exactly the same rule as those of the halogen 

 and alkyl compounds of the elements. 



Relation 5, The differences referred to in (4) increase as 

 the difference betiveen the atomic weights of the halogens (or 

 of the alkyl radicals) increases. In the case where the differ- 

 ence between the alkyl radicals is the same, the differences be- 

 tween the boiling-points (or melting-points) diminish as the 

 sum of the atomic iveights of the several pairs of alkyl radicals 

 increases. (See Tables IV. and V.) 



Relation 6. The differences referred to in (4) diminish 

 algebraically as the atomic iveight of the hydrocarbon radical 

 increases. (See Table V.) 



