200 EDWARDS, ON FINDERS. 
to a period anterior to the Tertiary strata of this country. 
Surely^ if the bones of the iguanodon had found their way 
from the Wealden to the Red Crag_, and had been rolled and 
tossed about in transitu, they would have presented to the 
eye very similar mineral characters ; in fact, I have a small 
portion of rolled bone in Oolite, having the same gloss and 
fracture ; but as this is not a microscopical question, I need 
not pursue it any further. 
If the assumption of Sir Charles Lyell is worthy, as it 
seems to be, of our consideration, and that, to quote his 
striking language, "we may now with more confidence 
assume that the sea of the Coralline Crag was open to the 
south, so that shells of southern forms lived in it, until at 
length the bed of the sea having been upraised 650 or 700 
feet, all communication with warmer latitudes was cut ofP, 
and the fauna of the Red Crag acquired its more boreal 
characters then, upon this hypothesis of a sea open to the 
north, and by the destruction of strata as well, fragments of 
fossil bone would have got into the Crag sea, as Drift fossils 
now are continually doing on the Norfolk coast, and were 
rolled along the beach perhaps for ages, and during which 
they might have travelled considerable distances. How little 
should we have known of the animals whose bones have 
been found in Kirkdale Cave, if Hyaenas had not resorted 
there. So in reference to the rolled bones of the Hed Crag, 
the accidental circumstance of their having been treasured 
up therein as relics of the ravenous sea, has given us a 
knowledge of them which otherwise we could not have 
obtained, whether they belonged to the Tertiary or Secondary 
epoch. 
On " Finders " for Microscopes. 
By Arthur M. Edwards, of New York, U.S.A. 
The importance of having an instrument, simple, and at 
the same time accurate, for the purpose of registering objects 
mounted on microscope-slides, so that they can easily and 
with certainty be again found, has occupied the minds of 
microscopists at different times ; and several pieces of appa- 
ratus, more or less complicated, have been the result. 
Perhaps the best of these is that invented by the late 
Professor J, W. Baiicy, whose recent loss cannot be felt more 
