XI PHENOMENA OF ORGANIC NATURE 353 
which will be requisite to consider carefully ; and 
the first point for us is to examine how much the 
extinct Flora and Fauna as a whole—disregarding 
altogether the swecession of their constituents, of 
which I shall speak afterwards—differ from the 
Flora and Fauna of the present day ;—how far they 
differ in what we do know about them, leaving 
altogether out of consideration speculations based 
upon what we do not know. 
I strongly imagine that if it were not for the 
“peculiar appearance that fossilised animals have, 
any of you might readily walk through a 
museum which contains fossil remains mixed up 
with those of the present forms of life, and I doubt 
very. much whether your uninstructed eyes would 
‘lead you to see any vast or wonderful difference 
between the two. If you looked closely, you would 
“notice, in the first place, a great many things very 
like animals with which you are acquainted now: 
you would see differences of shape and proportion, 
but on the whole a close similarity. 
~ Texplained what I meant by OrpERs the other 
day, when I described the animal kingdom as 
being divided into sub-kingdoms, classes and 
‘orders. If you divide the animal kingdom into 
orders you will find that there are above one 
hundred and twenty. The number may vary on 
one side or the other, but this is a fair estimate. 
‘That is the sum total of the orders of all the 
os, which we know now, and which have 
mo VOL. II A A 
q 
