[ 397 ] 
X. Bakeeian Lecture.— On the Relations hetiveen the Viscosity [Internal Friction) 
of Liquids and their Chemiccd Nature. 
By T. E. Thorpe, F.R.S., and J, W. Eodger, Assoc. R.C.S. 
Received and Read Febrnary 22, 1894. 
[Plate 8.] 
Contents. 
Paet I.—jSTature of the Investigatiox : jMethod of Observation, &c. 
Historical Introduction. . 
The viscosity coefficient and modes of measuring it. 
Description of apparatus and method employed. 
The constants of the apparatus. 
Purity of the liquids employed. 
Deduction of working formula. 
Formulie connecting viscosity and temperature. 
Scheme of Avoi'k. 
Page. 
397-406 
407- 408 
408- 421 
422-432 
432- 433 
433— 438 
438-440 
440-443 
Part IL— -The Results Obtained, 
Viscosity-coefficients at the temperatures of observation for the various liquids, and 
formulse connecting the coefficients with the temperature. 443-548 
Part III.— Discussion of the Results Obtained. 
Introduction. 548-549 
Graphical l epresentation. 549-573 
Algebraical representation.5G3-586 
Viscosity magnitudes at comparable temperatures. 586-589 
A. Boiling'-points. 589-621 
B. Corresponding temperatures...321 
C. 1. Temperatures of equal slope. 622-688 
2. Generality of the results at equal slope. 688-694 
3. Comparisons at different slopes. 694-695 
Temperatures at equal slope. 695-704 
General conclusions regarding physico-chemical comparisons. 704-705 
Other methods of obtaining and compai’ing viscosity magnitudes.705 
Appendix ... 7. 706-710 
PART I. 
Introduction. 
During the half century which has elapsed since Hermann Kopp directed attention 
to the connection which exists between the molecular w'eights of substances and their 
MDCCCXCIV.—A. 3 e”' 7.11.94 
