Read it through once

In good soil there might indeed be tall and magnificent trees. But it would be quite impossible to see them! The giants of the forest would be concealed in an inextricable tangle of young trees, brushwood, fallen logs, creepers, and undergrowth. Where the soil was sandy or stony, it might be a scrub rather than a forest, of gnarled, twisted, and stunted oaks, or possibly thickets of sloe, birch, rowan, hawthorn, brambles, and briers.