298 Scientific Intelligence. 
inasmuch as the first egg would be — of being developed under 
different circumstances from the later o 
How Prof. Owen meets this difficulty with regard to the first intro- 
duction of species may be inferred from the following passages quoted 
from the monograph on the Aye-Aye. 
“ But the conception of the origin of species by a continuously ope- 
rative ott cause or law is one thing; the knowledge of the nature 
and mode of operation of that law is another thing. One er 
mh accept, another refute or reject, a transmutational or natural-se 
tive hypothesis, and both may equally hold the idea of the successive 
coming-in of species by law.” 
“What I have termed the ‘derivative hypothesis’ of organisms, for 
example, holds that there are coming into being, by aggregation of or- 
ganic atoms, at all times and in all places, under the simplest unicellular 
condition, with differences of character as many as are the various cir- 
cumstances, conditions, and combinations of the causes educin them,— 
one form appearing in mud at the bottom of the ocean, another in the 
toma or the heath, a third in the sawdust of the cellar, a fourth on the 
mountain rock, &c., but all by the combination and ar- 
iyenens of organic atoms throu forces and conditions acting ac- 
formed beings 
and have been derived all other and higher forms of organisms on this 
et. And thus it is that we now find, energizing in fair pape ire 
every grade of organization from man to the mo nad.” 
“ Now the foregoing hypothesis is at present based on narrow re 
perhaps as supporting cypthogners directing where that road — 
ra likely be — in with.” . s 
“ And herein is one main distinction between it (origin of spe- 
cies by natural ibedink and the ‘ derivative hypothesis,’ which main- 
tains that single-celled organisms, so diversified as ~ be relegated to 
distinct orders and classes of Protozoa, are now, as heretofore, in —— 
‘life which i's propounded Mr. Darwin’s dig soa 
id Frese antares oe ee 
. are the sin cebsenil-oeinatigeimean sil 
anche at mee ple ipttcaninlogical fact fact of the succes- 
