264 A. M. Mayer—Erratum of the Errata. 
Art. XXXIIL—Erratum of the Errata, or “‘ A Few Millions ;” 
by ALFRED M. Mayer, Ph.D. 
I am indebted to Mr. A. Cowper Ranyard, of London, for 
calling public attention to errors existing in the illustrative ap- 
pendix to a research entitled “ Acoustical Experiments, &c., 
which article of mine the editor of Natwre honored with a re- 
publication in his journal, on May 9, 1872. 
The existence of these errors has been known to me since a 
few weeks after the original publication of my paper; but as 
they did not affect in the least the subject prom of the 
rect calculation 
185,300 miles= 298,212,000,000 millimeters _ 
0005895 millimeter 
and 5,058,700,000,000,000 (Mr. R.’s result) minus 505,870,000, 
000,000 (Mr. M.’s result) gives Mr. Ranyard 4,552,830,000,000,- 
000 tremors. 
Thus it appears that both Mr. Ranyard and myself can com: 
mit errors in simple arithmetic ; but I am sure that our mutu 
friends will not attribute them to want of sufficient ere 
wate 7 soi as ’ 
do not wish Mr. Ranyard’s errors in any way to extenuate MY. 
own greater negligence, which has gr pls: § 
my paper; containing, as it does, “some strange numerical 
errors, which perhaps it will be well to point out, lest some 
of Le readers should make use of the numbers given at te 
end of the paper without previously testing them.” (A. ©. R.) 
I will, therefore, ask my readers to substitute the following for 
the second paragraph under the heading of = 
Bs mseaw cei Relations in the eaperiments and analogical facts 
he phenomena of light. 
* See Nature, June 20, 1872, p. 142. 
