ie at the basis of all Physical Geology.

[A] For a fuller account of the literature and history of advancement of
human knowledge as to Earthquakes, here merely glanced at, I must refer
to my First Report on the Facts of Earthquakes, "Reports, British
Association, 1850," and to the works of Daubeny, Lyell, Phillips and
others, its _complete_ history remaining yet to be written.

[B] Yet how indistinctly formed were Young's ideas, and indistinct in
the same direction as those of Humboldt, becomes evident by a single
sentence: "When the agitation produced by an Earthquake extends further
than there is any reason to suspect a subterraneous communication, it is
probably propagated through the earth nearly in the same manner as a
noise is conveyed through the air."--_Lectures, Nat. Phil._, Vol. I.

[C] The Right Rev. Charles Graves, F.R.S., etc., then Fellow of Trinity
College, Pres. R. I. Acad., and now Bishop of Limerick, on presentation
of the Academy's Cunningham Medal.

[D] In this Report, though I have never before referred to it, and do so
now with reluctance, I have always felt that the Author did me some
injustice. The only reference made to my labours, published the
preceding year only, is in the following words: "Many persons have
regarded these phenomena (viz., Earthquakes) as due in a great measure
to vibrations ... and the subject has lately been brought under our
notice, in a Memoir by Mr. Mallet, 'On the Dynamics of Earthquakes,' in
which he has treated it in a more determinate manner, and in more
detail, than any preceding writer" (p. 74). If that Paper of mine be
collated with this Report, it will be, I believe, found that, as
respects the earthquake part, the latter tint parades, in a mathematical
dress, some portions of the general theory of earthquake movements,
previously published by me as above stated. So, also, in the chapter (p.
90) referring to Seismometry, and the important uses to Geology that
might be (and since have been, to some extent) made of it, no mention is
made of those instruments previously proposed by me, nor of my
anticipation of their important uses. This is but too mortifyingly
suggestive of the--

"Pereant qui mea ante mihi dixerunt."

Having left this unnoticed for so many years, and during which the
Author has preceded me to that bourne where our errors to each other
must be forgotten, I should certainly not have now trespassed on the
good rule, _De mortuis nil nis