142 



IlEPOBX — 1881. 



from Upsala observations 

 Ups.' S. 3, 1,211) for 



Argillaceous sand -— 



CO 



of underground hemperature (' Act, Reg. Soc. Sci. 



26952 



S... 1-725 

 1-821 



•4416 



K... -2053 



sec. , 



^7—, we get 

 min. 



•4448 . -2264 



00342 and -00377 as the values 



Moist clay . . -27958 

 Eeduced to B.A. units, multiplying by 



of K. 



Gripon, ib. 32, 547 (1866). — Mercury, by Peclet and Despretz' method. Results 1-67 

 (Pb = 3-84, Peclet) ; 354 (Ag = 100). 



Guthrie, ib. 35, 283 (1868). — Liquids : film of liquid sustained by adhesion between 

 two flat plates ; one the lower surface of heating steamer, the other the upper 

 surface of ' bulb ' of air-thermometer. Order of conductivity only : Hg, water, 

 oil of turpentine, glycerine, amjd iodide, nitro-benzene, aniline. 



Paalzow, ib. 36, 469 (1868). — Liquids. Despretz' method, using glass vessel (60 mm. 

 diameter), and four thermometers. Order of conductivity only : Hg, H.,0, Sat. 

 CuSOj, H2SO4 (1-25), Sat. ZnSO„ Sat.' NaCl. 



McFarlane, ib. 43, 392 (1872). — External conductivity (emissive power) of Cu. 

 Ratio of polished to blackened surface, for differences from 5° to 60° C., nearly 

 constant at -690. 



Mayer, ib. 44, 257 (1872). — Application of double iodide of Hgand Cu, which changes 

 colour at 70°C., to determine crystal conductivities after de Senarmont's method. • 



Weber, ib. 481. — Fe and German silver ; used Neumann's modification of l.ngstr6m's 

 method, bringing the two ends of a bar alternately for stated periods to tempera- 

 tures U|, and u,, and observing by thermopairs the constant temperature ultimately 

 attained by the middle point, and the difference of temperature between points 

 distant J and | of the whole length of the bar from one end. These give two 

 relations between // and 7i (mathematical exposition given in paper) whence 

 values of h and 7i are deduced. 



For Fe, k. = -1485, /* = -000266 (@, 39° C.) 



For German silver, Z; = -08108, k = -000304 (@, 31° C.) 



Eumford, ♦ Ph. Trans.' 1804, 23. — Holes in glaciers filled with water, how explained. 

 Reply to Murray's and Thompson's remarks on his former experiments. No 

 experiments. 



Hopkins, ib. 1857, 805. — Rocks, 5-in. disc, about IJ — 2" tliick, surrounded by a 

 square block of substance of similar conductivity, resting in contact with Hg, and 

 having upper surface covered with layer of Hg. Lower Hg heated by steam or 

 otherwise, and when stationary state had supervened, temperatures of lower and 

 upper Hg (taken as those of lower and upper surface of rock) read along with 

 atmospheric temperature. Comparative values of k thus obtained. 



