176 Dr. Tycho E:son Auren on 



the importance o£ the here observed difference can hardly 

 be discussed more in detail. Yet I should wish to add 

 that on examining other kinds of graphite I have found 

 about the same difference. Since the chemical compounds 

 examined must be regarded as particularly pure, and in 

 any case not to contain heavier elements, we may surely 

 assume that the values found for k c , ho are thoroughly 

 reliable. 



In the following table are given, by means of the 

 values found for /c H , H , # C /jj q, and ^q/ H q 5 the calculated 

 values of *wjj for the organic compounds mentioned 

 above, compared with corresponding observed values. 



Table IV. 



Comparison between calculated and observed values 



for tf A/H in organic compounds. 



I. II. III. IV. 



Substances. Qh& c ^ ^ Cak 0bg Calc< obg 0alc 



Methyl alcohol, CH 4 1*59 157 1'62 1-61 165 166 1/71 1'72 



Methyl formate, C 2 H 4 2 2'90 2'92 2'95 2'98 2-98 302 305 307 



Allyl alcohol, C 3 H G 2-59 260 275 271 2-S8 2-84 3-01 2'98 



Acetone, C 3 H 6 2-59 260 271 271 278 2'84 2-88 2*98 



Propionic acid, 3 H 6 O 2 3-47 3*49 3-58 3-59 3-62 3*68 376 379 



Ethyl formate, C 3 H 6 2 " 3-46 3*49 3'56 3'59 3*66 3-68 3*81 379 



Carbonic acid climetylester,C 3 H 6 3 4-35 4"39 4-46 4'47 4'59 4'52 4'61 460 



Isopropyl alcohol, C 3 H 8 0.... ' 2'65 270 2-85 2-84 3'07 2'99 3-16 3-17 



Methylal, C 3 H 8 2 3'57 3-60 3'68 371 3-85 3"84 4"02 3'98 



Methyl ethyl ketone, C 4 H 8 319 3-16 3*38 3-33 3*61 3"50 3-90 370 



Ethyl acetate, C 4 H 8 2 4-15 4'06 4*28 4-20 4"43 4"34 463 4-51 



Benzene, C 6 H 6 3-25 309 3'40 3*31 355 3-52 3'83 377 



Toluol, C 6 H 5 CH 3 366 3'65 385 392 4-08 4*18 4-42 4"49 



Benzyl alcohol, C 6 H 5 CH 3 458 4"55 477 4"80 502 5'02 5-28 5'30 



Paraldehyde, C 6 H 12 3 6*09 6"09 6-24 6'31 6'46 652 671 677 



Octane, C 8 H 18 470 4-64 502 5-02 5'42 5*47 5'82 5*96 



Octyl alcohol, C rf H 18 554 5'54 5*92 5-90 6'28 6-31 6*64 678 



For nitrogen I have calculated « N / H q from the deter- 

 minations of k . H/0 for the compounds given in Table V., 



where besides N only H, O, and C are component parts. 



In determining a; , H Q for other elements than those now 

 dealt with, chemical solutions of different kinds have been 

 used. By determining ^ A/H for H 2 S0 4 , Na 2 S 2 03 7 HC1, 

 NaCl, and NaOH (Table VII.), and also by the aid of 



