for the composer Mary Snow, see Mary McCarty Snow Christine Mary Snow (Pilkington) (1902–1978) was an Oxford botanist who contributed to the study of geotropism and phyllotaxis. She is known for her co-development, with her husband Robin Snow, of the "Snow and Snow Rule": a new primordium (such as a leaf) appears in a plant as soon as and in the place where it has enough space to do so. Mary Pilkington was the daughter of wealthy glass manufacturer Alfred 'Cecil' Pilkington (1875–1966). She was born in Rainhill, Lancashire, on 1 Aug 1902, and became an exhibitioner of St Hugh's College, Oxford in 1922. She graduated with first-class honours in botany in 1926 and was a research student at St Hugh's in 1925. In 1926 she became the first research student of George Robert Snow (1897–1969), a botanist and fellow of Magdalen College, Oxford, and was awarded the BSc, a research degree, in 1929....
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