between the viscosity of liquids and theib, chemical nature. 487 
In reducing the observations, the value 0‘8953 for the density at 0 °, and the 
relative volumes at different temperatures given by Pierre and Puchot (‘ Ann. de 
Chim. et de Phys.’ (4) 22 , 310), were employed. 
Taking 
7 ^^ = -005816 ■'173 = -002877 773 (calculated) = -004091 
= 0°-35 i^g = 65°-30 ^2 (from curve) = 29°-78, 
we obtain the expression 
61-940 
“ (141-87 + ’ 
which gives values agreeing closely with those obtained by observation. 
Mean temp. 
'/• 
Difference. 
Observed (mean). 
Calculated. 
0 
0-35 
-005816 
-005816 
■000000 
5-97 
-005401 
-005409 
+ -000008 
11-95 
-005015 
-005022 
+-000007 
18-69 
-004637 
-004635 
-■000002 
23-47 
-004386 
-004388 
+-000002 
29-46 
-004102 
■004105 
+-000003 
37-32 
-003768 
■003775 
+ -000007 
42-43 
-003575 
■003581 
+-000006 
48-71 
-003359 
■003364 
+ -000005 
53-74 
-003197 
■003204 
+-000007 
60-26 
-003007 
■003013 
+-000006 
65-30 
-002877 
■002877 
■000000 
Allyl Chloride. CH3:CH.CH3C1. 
Made by the action of phosphorus trichloride on allyl alcohol by Mr. J. G. Salt- 
marsh, A.P.C.S., to whom we are indebted for the preparation of the other haloid 
derivatives of allyl employed by us. The purified product boiled between 44°’95 and 
45°-13. Bar. 752-4 miUims. Corrected and reduced b.p. = 45°-29. 
Vapour density : 
Found, 38*54. Calculated, 38-18. 
Observations for viscosity : — 
