174 Dr. TychoErson Auren on 



The values found for ^Qng- q, as shown from the table, 

 agree very fairly. On the ground of the additive law 

 and by the aid of the mean values above, we find corre- 

 sponding values for hydrogen, a: h/h q , if the molecular 



absorption coefficient of water be denoted = 1 : 



I. IT. III. IV. 



* H/H0 = 0-052 0-061 0-078 0*094 



In the same manner, by means of the values found for 

 *H/H and a"q,jj- q, the corresponding coefficients for C 

 may be computed. In the following tal>le we again find 

 the values obtained from the observations for « A / H 



indicated in Table II., and also those obtained from 

 observations relatively to methyl alcohol and benzene 

 (Table TV.). 



Table III. 



Atomic absorption coefficients for carbon in relation to the 

 molecular absorption coefficient of water. 



I. II. lift IV. 



Substance. 



K C/H 2 0" '-C/IL.O' ^C/HaO' K C/H 2 0» 



Methyl formate, C 2 H 4 0, 0*450 0475 0490 0-525 



Paraldehyde, C e tf la O s 0*463 0469 0'497 0-526 



Propionic acid, C 3 H 6 2 0-457 0-487 0-488 0-524 



AUyl alcohol, C 3 H e O 0'460 0-502 0'522 0*544 



Acetone, C 3 H e O 0*460 0'489 0*489 0*503 



Carbonic acid dimethylester, C 3 H 6 0, 0*450 0*487 0*530 0*536 



Ethyl formate, C 3 H C 6 2 0*452 0-479 0-505 0*540 



Methylal, C 3 H 8 2 0'453 0479 0*512 0*547 



Isopropyl alcohol", C 3 H 8 0-445 0*495 0*534 0*531 



Ethyl acetate, C 4 H 8 6 2 0*485 0*509 0*529 0*566 



Methyl ethyl ketone, C 4 H,0 0*469 0504 0*518 0'572 



Benzyl alcohol, C 6 H 3 CH 3 0*467 0*485 0*507 0*547 



Toluol, C 6 H 5 CH 3 0*463 0478 0*492 0*505 



Octyl alcohol, C 8 H 18 0-463 0*493 0'504 0*516 



Octane, C 8 H 18 0*470 0*490 0*502 0*515 



Methyl alcohol, CH 4 0*485 0*508 0*494 0*521 



Benzene, C 6 H G 0*488 0*506 0*514 0*543 



Mean 0*462 0*490 0*508 0*533 



There is a very fair agreement between the values founds 

 from different compounds, as appears from the table. 

 There does not appear to be any difference between carbon 



