An equal ratio arm, capacitance-conductance bridge, operated at frequencies below 100 kilocycles per second, was med to measure the dielectric constant of water with an accuracy of better than 0.1 percent at 5-degree intervals over the range .0° to 100° C. At 25° C the dielectric constant was found to have the value 78.30, which is about 0.3 percent lower than t hat usually accepted. The data fit the equation E= 87. 740 -0.400081+ 9.398(10-4) tL 1.410 (10-6 )13, with a maximum deviation of 0.01 unit in dielectric constant. The experimental method and sources of error are considered in some detail.

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Th e dielectric constants of aqueous solut ions of dextrose and of sucrose prepared from N BS Standard SampJes were d etermin ed a t 20°,25°, a nd 30° C fo r cOJlcentra t ions upto 50 and 60 p erce nt by we igh t, respective ly. A bri dge method wa s used , a nd t he so urceE of errol' involved are con sidere d. Th e r esu lts, relative to a se lected valu e for water, ar e considered t o be accurate to 0.05 percent or better and are expr essed in term s of an e mp iri cal e quation for the pu rposes of in terpola t ion.

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