tendency to development,—thus giving us an idea or ® ™ 
"gale should 
162 Review of Darwin’s Theory on the Origin of Species. 
of time, is by no means a novel proposition. Not to speakal 
ancient speculations of the sort, it is the well-known Lamarekia 
theory. rst difficulty which such theories meet with 
that, in the present age, with all its own and its inherited pre: 
judgments, the whole burden of proof is naturally, and indeed 
properly, laid upon the shoulders of the propounders; and thus 
far the burden has been more than they could bear. mn th 
very nature of the case, substantive proof of specific creation 18 
not attainable; but that of derivation or transmatation * 
i 0 
quate causes, the natural or necessary result of which must be 
to produce the present diversity of species and their actual te 
body of facts to such assumption, and also to adduce instances 
explicable by it and inexplicable by the received view,—80 P@ 
haps winning our assent to the doctrine, through its compe 
to harmonize all the facts, even though the cause of the asst 
ae remain as occult as that of the transformation of 
poles into frogs, or that of Coryne into Sarzia. 
* The first line of proof, sncsolatully carried out, would = 
lish derivation as a true physical theory; the second, as 4 
eient hypothesis. : hich 
Lamarek mainly undertook the first line, in a theory ¥ vedit 
has been so assailed by ridicule that it rarely receives poe 
count for a progressive change in species through the ir 
fluence of physical agencies, and through the appetencies a 
of the Natural History of Creation can hardly be said mi the 
undertaken either line, in a scientific way. He would exp 
whole progressive evolution of nature by virtue of an 12 * 
place of a natural cause, a restatement of the proposition ° pro 
of an explanation. Mr. Darwin attempts both lines inly 
b 
ae 
‘upon the first; for, as he does assign real causes, he 1 bound 
equacy. : i 
$e kept in mind that, while all direct proof ¥ the 
ent origination is unattainable from the natu 
2 overthrow of particular schemes of cone go o 
Shed the Fy Sica proposition. a pin = Ly ; 
Mid PPO to account for derivaile™, gains 
*pparent, or unanswerable objections may be urged a 
