ERRATA IN MR. MALLET’S SECOND REPORT ON EARTHQUAKES. 
Since the printing of the preceding Report the following errata have been 
discovered :— 
In page 288, line 5 from bottom, for 0'-014206 read 0'-014286. 
-— 289, line 14, for 0'013910 read 0'-013903. 
—— — line 30, for 0'"41743 read 0'"41726. 
—— — lune 31, for 0"-013914 read 0"-013909. 

[The preceding corrections apply also to the table of chronograph ratings 
at foot of p. 289. ] 
In page 290, line 2, for 0013914 read 0'013909. 
— —- — for 0""006956 read 0"-006954. 
—— 293, line 1, for ratio read rate. 
—— 298, line 33, for 307-05 read 307°50. 
——— 299, line 12, for 9:607 read 9°609. 
—— 306, line 13, supply a comma after the word “ dial”’. 
—— 306, line 4 from bottom, supply a comma after “ dial ”’. 

These errors are all small, and affect the results within limits much less 
than those of the differences between one experiment and another. A single 
arithmetical mistake remains however to be noticed, which alters consider- 
ably the constant of wave transit im sand as deduced from the experiments ; 
namely, that in page 292, line 3 from bottom, *8 was read instead of *3, at 
the beginning of the number representing the average of col. 4. The result 
of the subtraction should therefore be 3!'"411639 instead of 2!911639, and 
hence the gross rate of transit in sand =774°568 feet per second. Using 
this corrected number in the calculation (p. 307) of the distance lost in 
raising the wave in the seismoscope, and applying throughout the small 
corrections mentioned above, the true rates of transit are— 
LETS} 07 RES A Apapeemee nocpoooececsocopocoanscen 824915 feet per second. 
In discontinuous Granite .......seeceeee 1306°425 be 
In more solid Granite .......c.seeseeeee 1664°574 - 
which numbers should therefore be substituted for those given in pp. 307, 
308. 
This correction still further removes any probability of aérial commotion 
having at all interfered in the Killiney experiments: see pp. 303-305. 
The Catalogue of Earthquakes contained in Mr. Mallet’s Report will be 
continued in the next volume. 

