 Schooling communicated some of his discoveries with Barr to Cook after seeing an article by Cook about phyllotaxis, the arrangement of leaves on a plant stem, which often approximates the golden ratio.Schooling published his work with Barr later, in 1915, employing the same notation.Barr also published a related work in "The Sketch" in around 1913, generalizing the Fibonacci numbers to higher-order recurrences.