Ies Rafael Alberti- Coslada CHARLES DARWIN Ies Rafael Alberti- Coslada

The Voyage of the Beagle After graduating from Cambridge in 1831 and at the age of 22, Darwin went on a scientific expedition around the world on board HMS Beagle as a naturalist without pay, thanks largely to Henslow's recommendation. The expedition lasted five years and collected hydrographic, geological and weather data in South America and many other places. Darwin's observations led him to develop the theory of natural selection.

SECOND TRIP Second trip: Robert FitzRoy was again appointed commander of the Beagle, this time, head of the second expedition (1832- 1835), which complemented the first one, starting on December 27, 1831, after the departure had been delayed several times. Charles Darwin was on it as a naturalist. The Beagle returned in 1835.

DEVELOPMENT OF THE THEORY In order to develop his theory, whenever it was possible, possible, he disembarked to make observations and collect specimens. He rented horses and guides, camped in the open air,climbed mountains and rented houses for weeks, while Fitzroy toured the continent and went up rivers.

5 OBSERVATIONS OF DARWIN Observation 1. The species have great potential for fertility, a fact he had already observed that Malthus reminded. Observation 2. Stocks tend to retain their shares. The vast majority of the populations are stable. Observation 3. Food resources are limited and are almost always kept regular. These three observations Darwin inferred that in an environment of stable food resources, and excessive proliferation of individuals, they will face the struggle to survive. Observation 4. There are no two identical individuals. The variability is universal. This can be illustrated with the case of the Asian ladybug Comment number 5. Much of the variation is inherited.