LAMARCK’'S THEORY OF DESCENT 285 
ization, which are designated by the expression of 
Spontaneous g generations ; 
a That the first germs of the animal and plant 
having been formed in appropriate places and cir- 
cumstances, the faculties of a beginning life and of an 
organic movement established, have necessari ily grad- 
ually developed the organs, and that with time ‘they 
have diversified them, as also the parts; 
“4. That the power of growth in each part of the 
organized body being inherent in the first created 
forms of life, it has given rise to different modes of 
multiplication and of regeneration of individuals; and 
that consequently the progress acquired in the com- 
position of the organization and in the shape and 
diversity of the parts has been preserved ; 
ae That with the aid of sufficient time, of circum- 
stances which have been necessarily favorable, of 
changes of condition that every part of the earth’s 
surface has successively undergone—in a word, by 
the power which new situations and new habits have 
of modifying the organs of living beings, all those 
which now exist have been gradually formed such as 
we now see them; 
“6, Finally, that, according to a similar order of 
things, living beings having undergone each of the 
more or less great changes in the condition of their 
structure and parts, that which we call a species among 
them has been gradually and successively so formed, 
having only arelative constancy in its condition, and 
not being as old as Nature herself. 
“ But, it will be said, when it is supposed that by 
the aid of much time and of an infinite variation in 
circumstances, Nature has gradually formed the differ- 
ent animals known to us, shall we not be stopped in 
this supposition by the simple consideration of the ad- 
mirable diversity which we observe in the zxstzncts of 
different animals, and by that of the marvels of every 
kind presented by their different kinds of zxdustry ? 
