Although there will always be a struggle for life between the inhabitants of the same pond, however few in kind, yet as the number even in a well-stocked pond is small in comparison with the number of species inhabiting an equal area of land, the competition between them will probably be less severe than between terrestrial species;
(the number even in a well-stocked pond; is; small) (species; inhabiting; an equal area of land) (the competition between them; will probably be; less severe than between terrestrial species)
the number even in a well-stocked pond species the competition between them
is inhabiting will probably be
small
an equal area of land
less severe than between terrestrial species