PROCEEDINGS OF GEOLOGICAL SOCIETIES. 
71 
land and Freshwater shells, all of recent species, together with 
remains of fishes and insects ; and for the list of which I refer to 
Sir Charles Lyell's paper. Some mammahan remains have also been 
found, but the only bone I myself obtained was, apparently, that of 
the ox. Now this deposit is underlaid throughout its width, and 
thereby distinctly separated from the Boulder clay, by the bed of 
ochreous flint gravel (&^), two to four feet thick. It is overlaid by 
by another bed of gravel and brick earth (a), of five to ten feet, also 
newer than the sands and gravel (/). The way in which these two 
gravels merge one into the other, at each end of the section, is very 
instructive. 
In superposition, therefore, above the Boulder clay, this bed resem- 
bles the Hoxne deposit, as it does likemse in its Freshwater character 
and shells, and in its unconformity to the existing line of drainage ; 
for a reference to the section w^ill show that this Mundesley deposit 
is not exactly coincident vnth the line of the present valley. I con- 
sider it is a deposit in which flint implements like those of Hoxne 
may probably be found — especially, however, would I suggest a 
careful search to be made in sandy part (h^), and the gravel (5^). 
The determination of the exact superposition of this bed is farther of 
consequence, inasmuch as some important questions, connected with 
the fauna of the pre-glacial and post-glacial periods, hinges materially 
upon it. In this inquiry, therefore, I have, for the present, limited 
myself merely to the question of position, and to pointing out the 
presence of the Freshwater shells at h^, and the band of mussels in /i^, 
otherwise leaving aside the other important question of organic 
remains.* 
I have annexed a rough but proportionate and measured section of 
the beds, taken at different favourable periods. 
PROCEEDINGS OF GEOLOGICAL SOCIETIES. 
Royal Institution.— Dr. Tyndall's lecture on the ISth uU. was a memorable 
one in the aunals of even that famous institution, of which Faraday is one of 
the brightest ornamants. The Radiation of Heat is an old and familiar 
subject; but Professor Tjndall has crowned it with some new and most important 
facts — " On the Influence of Gases and Vapours upon the Rays of Heat 
Emanating from a Dark Hot Surface." 
Before an audience of five hundred persons, of the highest rank and education 
in the metropohs, Dr. Tyndall, pale with anxiety for the success of those experi- 
ments, almost unrivalled in their dehcacy, on which the enunciation of his 
important facts depended, demonstrated forcibly the new truths that the heat 
radiated from dark bodies differs in many respects from the heat radiated by 
* I am happy to say that the fossils, both of the Forest bed and of the Fresh- 
water beds (h), are now enj^aging the active attention of a very zealous observer, . 
who will, no doubt, add materially to our present lists. 
