ROCK TEMPERATURES IN VICTORIA. 317 
of thermometer just described. Neither of these cases, 
-although under good and in quite new ground, were 
absolutely ideal, but they both point to a mean sur- 
face temperature (61°4° Fahr. and 61-9° Fahr. respec- 
tively) distinctly higher than the one commonly assumed 
for Bendigo by nearly a couple of degrees. By adopting 
the value 61°49 Fahr. as being from a spot nearest 
to the deep holes, we obtained a rise of 1° Fabr. 
for each 80 feet, or 1° Centigrade for each 144 feet, 
from both the experiments at ‘New Chum Railway ” and 
“North Garden Gully, &c.,” a figure that is of interest in 
view of the note already published by Professor David as 
regards the temperatures met with in the sinking at Sydney 
Harbour, and the approximate figures for Maldon and for 
Ballarat given above. 
The above work is merely put forward as giving some 
results that may be of interest, of work that is still pro- 
ceeding at the present time, and needs the co-operation of a 
great many persons before enough data can be considered to 
have been collected for generalisation as to the temperature 
gradients of this part of the Southern Continent; and it is 
intended to take all opportunity to test whether the rise is 
uniform within the limits of experimental error. 
As against the above figures, the following have been ob- 
tained by known observers recently in other parts of the 
world : — 
At St. Gothard a rise was noted of 1° C. per 108 feet 
*At Paraschartz, near Rybrick ... 1° C. per 111-9 feet 
py semiudebach, 2. :satseee, h.tecte Loe Cie pert 14 Bi feet 
At Sennewiez: 25-2. t-2 wes. LO Co per 118-1 feet 
+At aarp caeken. ses Se sureass 100: pers 90. fear 
In the Ruhr Coalfield . se(vser LOC, per. 925 feet 
To say 80 as time 
At the Sperenberg bore ... ... ... 19 C. im 105 © feet 
t At Pittsburg, U.S.A., a 5000-feet 
bore showed ... .. ee es “inna Aly ee sheet 
§SAt Calumet Sea Heclas sayalee 
Superior, todepth of 4580feet... 19 C. in 402-6 feet 
*Vereins Mitthutlingen zur Oesterreichische Zeitschift fur 
Berg. und Hiitten Wessen, 1895, p. 108. 
+ Gliickauf, 1900, p. 7383. 
{ School of Mines Quarterly N.Y., 1897, p. 148. 
§ Agassiz Amer. Jour. Science, Vol. i., 1895, p. 5038. 
