Evolution

We must now turn to the main project of this book, which is to attempt to trace out the lines along which animal Evolution has proceeded, with special reference to that particul...

The subject of our discussion is now narrowed down to the group of the mammals. The mammals are characterised by two very obvious features: a body-covering of hair, and a set of...

The lowest of the vertebrates--if indeed it can be called a vertebrate at all, seeing that it has no vertebræ--is the lancelet, Amphioxus. The common species of this animal (the...

The somewhat miscellaneous collection of animals that have been thrown together and termed _worms_ is of the greatest importance for our theory of descent. Indeed, it seems prob...

The idea of Evolution is an old one. It is older than the Darwinian hypothesis; it is older than Lamarck, who published his particular theory in 1809, the year that Darwin was b...

The Amphibia are the oldest and the lowest group of vertebrates that are able to lead an active existence on land, and the characters which distinguish them most definitely from...

For many of the illustrations the Publishers are indebted to the Deutsche Verlags-Anstalt (from Günther's _Vom Urtier zum Menschen_) and Herr Wilhelm Engelmann (from Haeckel's _...