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82 Mr Oaley, Magnetic Susceptibility with Temperature. ; 
III. 2:0 Normal Solution of Ferric Chloride. 
Pressure Mean Time Corrected Time 
(mm. water) temperature (seconds) (P. 85 mm.) 
85'8 84-6 133-25 134-7 
85:5 76°8 147-25 1480 
85:9 70:3 162°25 164-0 
85:7 69:7 161-0 162-4 
84:9 64°8 181-0 181-0 
84:3 61:5 200-0 198 3 
85 0 54°5 213-0 213°0 
84-4 46-0 258°5 256-7 
85°6 44-5 250-75 252°6 
84:3 36°2 53 rs) 314:°7 
SoeGu 33°6 325-0 327-4 
85°8 27°45 377°0 380°6 
85:0 19-2 488-0 4880 
85:0 18-4 479-0 479 0 
85:8 18-2 484-25 489°] 
85-7 14:2 568-5 32 
86:4 12:3 625-0 635°7 
86:0 11-6 6335 6375 
86:0 11:05 647°5 651:5 
85-0 8-7 704-0 7040 
86:2 8-4 710-0 718-4 
85:0 78 742-0 742-0 
85-0 6-4 742-0 742-0 
85:1 4-4 795-0 794-0 
84-9 0-2 900-0 902-0 
84:6 0-2 900-0 896-0 
On account of the deliquescent nature of ferric chloride the — 
solutions were submitted to a chemical analysis (the permanganate — 
method was used) to determine their concentrations. The above 
observations have been plotted and are shown in fig. 5. The — 
ordinates are the times given in the last column of the tables— 
they are proportional to the viscosities—and the abscissae are the 
temperatures in degrees centigrade. 
On an examination of these curves it will be observed that the 
curves IIT and IV show irregularities with respect to the curves I, 
II and V, which are very nearly hyperbolae. III and IV are 
parallel over a short range of temperature in the neighbourhood 
of 15°C. The dotted line shows the position of the hyperbola 
which passes through the end points of the curve—the position of 
the points A, and the direction of the curve at the highest 
