...a leverage; and, last of all, their burrows facilitate the penetration of the roots. Says Darwin: " The plough is one of the most ancient and most valuable...existed, the land was, in fact, regularly ploughed by earth worms. It may be doubted whether there are many other animals which have played so important...

...superficial mould over any smooth expanse has passed, and will again pass, every few years, through the bodies of worms. The plough is one of the most ancient...still continues to be thus ploughed, by earthworms." The group to which earthworms belong is closely related to that which includes Nereis of the seashore....

...as they could bury would supply little food for their grubs. VII. FIELD-LABOURERS — continued. ' THE plough is one of the most ancient and most valuable...still continues to be thus ploughed, by earthworms.' Earthworms are continually busy about this work over pretty nearly the whole world, 'reversing the...

...any smooth expanse has passed, and will again pass, every few years, through the bodies of worms. Hie plough is one of the most ancient and most valuable...still continues to be thus ploughed, by earthworms." The group to which earthworms belong is closely related to that which includes Nereis of the seashore....

...ancient, as well as one of the most valuable of man's inventions, is the plough. But long before man existed the land was in fact regularly ploughed, and still continues to be ploughed, by earth-worms. No other animal has played such a part in history as have these lowly-organized...

...Describe the field labors of various kinds of beetles. CHAPTER VII FIELD-LABORERS— CONTINUED "The plow is one of the most ancient and most valuable of man's...before he existed the land was, in fact, regularly plowed, and still continues to be thus plowed, by earthworms." We have learned much about the earthworm...

...Worms." Darwin has shown beyond all dispute, as the result of his incomparable researches, that though " the plough is one of the most ancient and most valuable of man's inventions, long before he existed the land was in fact regularly ploughed, and still continues to be ploughed,...

...marvellous reflection that the whole of the superficial mould has passed, and will again pass, through the bodies of worms. The plough is one of the most ancient...ploughed, and still continues to be thus ploughed, by earth worms. It may be doubted whether there are many other animals which have played so important...

...smooth expanse has passed, and will again pass, every few years, through the bodies of worms. The plow is one of the most ancient and most valuable of man's...before he existed the land was, in fact, regularly plowed, and still continues to be thus plowed, by earthworms." Earthworms are also a source of disease....

...and those same burrows make convenient paths for the little roots of valuable plants. Darwin says, "The plough is one of the most ancient and most valuable...still continues to be thus ploughed, by earthworms." They reduce irregularities, and eventually bury stones and other objects; and by depositing little...