BETWEE^r THE VISCOSITY OE LIQUIDS AND THEIR CHEMICAL NATURE. 665 
The comparison of the observed values of the molecular viscosity work with those 
calculated by means of the above fundamental constants is given in the following 
table:— 
Molecular Viscosity AVork at Slope •O 4323 . 
Observed. 
Calculated. 
Difference 
per cent. 
Pentane. 
329 
332 
- 0-9 
Hexane. 
415 
412 
0-7 
Heptane. 
495 
492 
0-6 
Octane. 
574 
572 
0-3 
Isopentane . 
320 
324 
- 1-2 
Isohexane . 
404 
404 
0-0 
i Isoheptane. 
482 
484 
- 0-4 
Isoprene . 
284 
278 
21 
Diallyl. 
i 
356 
358 
- 0-5 
! 
' Methyl iodide. 
255 
264 
- 3-5 
Ethyl iodide. 
341 
344 
- 0-9 
Propyl iodide. 
425 
424 
0-2 
Isopi’opyl iodide. 
417 
416 
0-2 
1 Isobntyl iodide. 
1 
505 
496 
1-8 
Allyl iodide. 
399 
397 
0-5 
Ethyl bromide. 
282 
277 
1-8 
Propyl bromide. 
353 
357 
- IT 
Isopropyl bromide. 
346 
349 
- 0-9 
Isobutyl bromide. 
433 
427 
1-4 
Allyl bromide. 
327 
330 
- 0-9 
Ethylene bromide. 
450 
456 
- 1-3 
Propylene bromide. 
526 
536 
- P9 
Isobutylene bromide .... 
614 
608 
1-0 
Acetylene bromide. 
418 
409 
2-0 
Propyl chloride. 
294 
295 
- 0-3 
Isopropyl chloride. 
290 
287 
1-0 
Isobutyi chloride. 
364 
367 
- 0-8 
Allyl chloride. 
268 
268 
0-0 
Methylene chloride. 
241 
244 
- 1-2 
Ethylene chloride. 
326 
324 
0-6 
4 Q 
MDCCCXCIV.—A. 
