The development of the Vertebrate proceeds from an axis upward, in two layers, which coalesce at the edges, and also downward, in two layers, which l….

The distinguishing of the strata, or layers, in the embryonic membrane was a turning-point in the study of the history of evolution, and placed later….

Know thyself! This is the source of all wisdom, said the great thinkers of the past, and the sentence was written in golden letters on the temple of ….

All new ideas pass through three stages: first they are dismissed as nonsense, then they are rejected as being against religion and finally they are ….

The History of Evolution is the real source of light in the investigation of organic bodies. It is applicable at every step, and all our ideas of the….