29 
as the Lower London Tertiaries. In none of these 
rocks had an Ammonite ever been found. The last 
Ammonite disappeared with the Cretaceous period. 
It had been suggested that this special Ammonite was 
a ‘derived fossil,’”’ and brought there by the glacial 
drift. That theory was at once shown to be erroneous 
by the scratchings on the fossil, which were circular, 
and not longitudinal or even oblique. It was not a 
case of ice-grinding at all, but of recent grinding upon 
a grindstone. There was little doubt that it had been 
taken down into the boring in a workman’s pocket. 
then purposely imbedded in some of the blue clay and 
foisted upon the public. 
Mr. Frank P. Smith gave a lecture on ‘* The 
Infinitely Little ’’ (illustrated with lantern slides). 
In his introductory remarks, the lecturer stated, that 
perhaps, a more fitting title would have been, ‘‘ A Trip 
to the Infinitely Little,” for he intended to begin with 
the consideration of objects of large size. In order to 
convey to the audience a perfectly clear idea of the 
relative size of the objects which he wished to exhibit, 
he commenced with a few coloured examples of well- 
known insects, molluscs and birds’ eggs. These, he 
stated, were photographed approximately life-size 
upon the slides. A series of objects was then shown 
with magnifications ranging from eight diameters up- 
wards. A number of parasites were passed rapidly 
through the lantern, and also a selection of parts of 
well-known insects. A short account was given of the 
method employed by the larva of the ant-lion in 
capturing its prey, illustrated by a photograph of the 
head of the insect in question. This creature marks 
out a ring on a loose sandy soil, and then removes the 
earth within its area, forming a funnel-shaped depres- 
sion. At the bottom of this pit, it buries itself, leaving 
little but its jaws exposed. Unwary and over-curious 
ants soon begin to investigate this death-trap, and 
