between the viscosity op liquids and their chemical nature. 655 
CoREESPONDiNG Compounds. 
Iodide. 
Bx’oruide. 
Chloride. 
Acid. 
Alcohol. 
7](P. 
Diff. 
rjcP. 
Diff. 
TjdP. 
Diff. 
>jd^. 
Diff. 
Methyl. 
255 
95 
160 
129 
126 
Ethyl . 
341 
59 
282 
, . 
• . 
104 
237 
Propyl . 
425 
72 
353 
59 
294 
101 
321 
Butyl. 
• • 
397 
Isopropyl . 
417 
71 
346 
56 
290 
Isobutyl . 
505 
72 
433 
69 
364 
107 
398 
Allyl. 
397 
70 
327 
59 
268 
Ethylene. 
• • 
450 
(62) 
326 
The compound of higher molecular weight has invariably the higher molecular 
viscosity work. It is evident also that the same change in chemical nature corre¬ 
sponds approximately with the same change in molecular viscosity work. 
The value for an iodide is about 70 units greater than that for a bromide, and the 
value for a bromide is about 60 units greater than that for a chloride. 
The value for an iodide is greater by about 102 units than that for an acid, and 
methyl iodide has a value greater by some 130 units than that for methyl alcohol. 
Noemal Propyl and Allyl Compounds. 
Normal propyl. 
Diffei’eiice. 
Allyl. 
rjd^. 
Hydrocarbons. 
415 
(29) 
356 
Iodides . 
425 
28 
.397 
Bromides. 
353 
26 
327 
Chlorides. 
294 
26 
268 
Ethylene and Acetylene Bromides. 
Ethylene. 
Difference. 
Acetylene. 
>]d^. 
>jd^. 
Bromides. 
450 
32 
418 
The five comparisons show that the loss of 2 atoms of hydrogen and the gain of 
