222 = Dr Hrszerr on the Limestone of Burdiehouse, 
sion, have been frequently lost. Although coprolites contain- 
ing the indigested scales of fish are most abundantly diffused 
through the limestone, they seldom preserve any decisive form. 
An exception to this rule certainly occurs in the argillaceous 
shale lying above the limestone, indica- 
tive of a difference of circumstances by 
which the form of the coprolites has been 
preserved. This deposit was no doubt ori- 
|) ginally a turbid one, calculated to obviate 
~ the washing away of any foecal shape. 
Two representations of the smaller coprolites are here given. 
Their form is far better preserved than that of larger specimens. 
The larger coprolites attain a great size. I have seen them 
occasionally diffused over a surface of limestone to the extent of 
nearly a foot. 
These foecal remains are of a pale yellow colour, and have a 
very dull earthy aspect. In the shale they acquire a darker tint. 
Mr Connett has undertaken an analysis of these coprolites, 
which he has accomplished with his usual skill. Two of these I 
shall subjoin. 
First Second 
contains contains 
Phosphate of Lime, with a little Fluoride of 
Galciims: Glen ewe ee ua Oo US 83.13 
Carbonate of Lime, . . - - © es + 10.78 15.11 
Silica, cht Wats caer itne s Meseeats F422 .39 29 
ohana duSadanthityrs)acuncadhpulsels) AkceeebnieesDO 
with alkaline 
Bituminous matter, - - - . - se ee 3.95 1.47 { ree 
Phosphate of Magnesia, a trace. 
imal Matter, a trace. 
Animal Mai saan ae 
Another analysis of a Burdiehouse coprolite has been recently 
published by Dr Wirt1am Grecory and Mr R. Waker; but 
as the specimen was unfortunately mixed with foreign matter, 
as, for instance, with the sulphuret of iron, the result would 
rather mislead. These gentlemen have, however, conducted a 
5 
