At the same time Wallace became attracted by, and interested in, the flowers, shrubs and trees growing in that part of Bedfordshire, and he acquired some elementary knowledge of zoology. "It was," he writes, "while living at Barton that I obtained my first information that there was such a science as geology.... My brother, like most land-surveyors, was something of a geologist, and he showed me the fossil oysters of the genus Gryphæa and the Belemnites ... and several other fossils which were abundant in the chalk and gravel around Barton.... It was here, too, that during my solitary rambles I first began to feel the influence of nature and to wish to know more of the various flowers, shrubs and trees I daily met with, but of which for the most part I did not even know the English names. At that time I hardly realised that there was such a science as systematic botany, that every flower and every meanest and most insignificant weed had been accurately described and classified, and that there was any kind of system or order in the endless variety of plants and animals which I knew existed. This wish to know the names of wild plants, to be able to speak ... about them, had arisen from a chance remark I had overheard about a year before. A lady ... whom we knew at Hertford, was talking to some friends in the street when I and my father met them ... [and] I heard the lady say, 'We found quite a rarity the other day--the Monotropa; it had not been found here before.' This I pondered over, and wondered what the Monotropa was. All my father could tell me was that it was a rare plant; and I thought how nice it must be to know the names of rare plants when you found them."[3] One can picture the tall quiet boy going on these solitary rambles, his eye becoming gradually quickened to perceive new forms in nature, contrasting them one with another, and beginning to ponder over the _cause_ which led to the diverse formation and colouring of leaves apparently of the same family. It was in 1841, four years later, that he heard of, and at once procured, a book published at a shilling by the S.P.C.K. (the title of which he could not recall in after years), to which he owed his first scientific glimmerings of the vast study of botany. The next step was to procure, at much self-sacrifice, Lindley's "Elements of Botany," published at half a guinea, which to his immense disappointment he found of very little use, as it did not deal with British plants! His disappointment was lessened, however, by the loan from a Mr. Hayward of London's "Encyclopedia of Plants," and it was with the help of these two books that he made his first classification of the specimens which he had collected and carefully kept during the few preceding years.