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Darwin himself relates how illumination suddenly came to him. He had been reading, for his own pleasure, Malthus' book on Population, and, as he had long known from numerous observations, that every species gives rise to many more descendants than ever attain to maturity, and that, therefore, the greater number of the descendants of a species perish without reproducing, the idea came to him that the decision as to which member of a species was to perish and which was to attain to maturity and reproduction might not be a matter of chance, but might be determined by the constitution of the individuals themselves, according as they were more or less fitted for survival. With this idea the foundation of the theory of selection was laid. In _artificial selection_ the breeder chooses out for pairing only such individuals as possess the character desired by him in a somewhat higher degree than the rest of the race. Some of the descendants inherit this character, often in a still higher degree, and if this method be pursued throughout several generations, the race is transformed in respect of that particular character.

On one occasion a gentleman was returning home from a fatiguing journey, and became very drowsy. He fell asleep, and, strange to say, he also fell from his saddle, but in so easy a manner that the tumble did not rouse him, and lay sleeping on where he alighted. His faithful steed, on being eased of his burden, instead of scampering home as one might have expected, stood by his prostrate master, and kept a strict watch over him. Some laborers at sunrise found him very contentedly snoozing on a heap of stones. They wished to approach the gentleman, that they might awaken him, but every attempt on their part was resolutely opposed by the grinning teeth and ready heels of his determined and faithful guardian. They called out loudly, and the gentleman awoke and was very much surprised at his position, while his faithful horse showed his pleasure by neighing and scraping his feet on the ground. The gentleman then mounted, and they galloped away at great speed, both glad to be able to make up for lost time.

No one can doubt but that this deposit of cave earth itself requires a prolonged time for its accumulation.<8> But this period, however prolonged, at length comes to an end. From some cause, both animals and man again abandoned the cave. Another vast cycle of years rolls away--a time expressed in thousands of years--during which nature again spread over the entombed remains a layer of stalagmite, in some places equal in thickness to the first formation. Above this layer we come to a bed of mold containing remains of the later Stone Age, of the Bronze, and even of the Iron Age. Below the first layer of stalagmite--the completed biography of Paleolithic times; above, the unfinished book of the present. Such are the eloquent results obtained by the thorough exploration of one cave. The results of all the other explorations, in a general way, confirm these. Mr. Dawkins explored a group of caverns in Derbyshire, England. These caverns and fissures are situated in what is known as Cresswell Crags, the precipitous sides of a ravine through which flows a stream of water dividing the counties of Derby and Nottingham.

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