SEA AND ATMOSPHERE AND LIGHT. 403 
instrument passing onwards, as it were, through 
a series of experimental changes, from more 
simple into more complex forms ; it was created 
at the very first, in the fulness of perfect adap- 
tation to the uses and condition of the class of 
creatures, to which this kind of eye has ever 
been, and is still appropriate. 
If we should discover a microscope, or teles- 
cope, in the hand of an Egyptian Mummy, or 
beneath the ruins of Herculaneum, it would be 
impossible to deny that a knowledge of the prin- 
ciples of Optics existed in the mind by which 
such an instrument had been contrived. The 
same inference follows, but with cumulative force, 
when we see nearly four hundred microscopic 
lenses set side by side, in the compound eye of a 
fossil Trilobite ; and the weight of the argument 
is multiplied a thousand fold, when we look 
to the infinite variety of adaptations by which 
similar instruments have been modified, through 
endless genera and species, from the long-lost 
Trilobites, of the Transition strata, through the 
extinct Crustaceans of the Secondary and Ter- 
tiary formations, and thence onwards throughout 
existing Crustaceans, and the countless hosts of 
living Insects. 
It appears impossible to resist the conclusions 
as to Unity of Design in a common Author, 
which are thus attested by such cumulative evi- 
dences of Creative Intelligence and Power; 
