274 
THE PRINCIPLES OF 
Part II 1 - 
or by tbe spontaneous movements of the stamens ; and 1 
with the Algae, &c., by the locomotive power of the 
antherozooids. With lowly-organised animals perma- 
nently affixed to the same spot and having their sexes 
separate, the male element is invariably brought to 
the female ; and we can see the reason why ; for the 
ova, even if detached before being fertilised and not 
requiring subsequent nourishment or protection, would 
be, from their larger relative size, less easily transported 
than the male element. Hence plants 14 and many of 
the lower animals are, in this respect, analogous. The 
males of affixed animals having been thus led to emit 
their fertilising element, it is natural that any of their 
descendants, which rose in the scale and became loco- 
motive, should retain the same habit, and should closely 
approach the female, so that the fertilising element 
might not run the risk of a long transit through the 
waters of the sea. With some few of the lower ani- 
mals, the females alone are fixed, and with these the 
males must be the seekers. With respect to forms, 
of which the progenitors were primordially free, it i s 
difficult to understand why the males should inva- 
riably have acquired the habit of approaching the 
females, instead of being approached by them. But 
in all cases, in order that tire males should be efficient 
seekers, it would be necessary that they should be en- 
dowed with strong passions ; and the acquirement 04 
such passions would naturally follow from the more 
eager males leaving a larger number of offspring than 
the less eager. 
The great eagerness of the male has thus indirectly 
14 Prof. Sachs Lehrbucli tier Botanik,’ 1870, s. 633) in speaking 
the male and female reproductive cells, remarks, “ verlialt sick die ei B0 
“ bei der Vereinigung activ, ... die andere erscheint bei dor VereiB" 
ignng passiv.” 
