Berlin Arbeiterbildungsschule, an educational initiative for working class adults. Soon thereafter, he began to articulate his ideas on education in public lectures, culminating in a 1907 essay on The Education of the Child in which he described the major phases of child development which formed the foundation of his approach to education. His conception of education was influenced by the Herbartian pedagogy prominent in Europe during the late nineteenth century, though Steiner criticized Herbart for not sufficiently recognizing the importance of educating the will and feelings as well as the intellect. In 1919, Emil Molt invited him to lecture to his workers at the Waldorf-Astoria cigarette factory in Stuttgart. Out of these lectures came the first Waldorf School. In 1922, Steiner presented these ideas at a conference called for this purpose in Oxford by Professor Millicent Mackenzie. He subsequently presented a teacher training course at Torquay in 1924 at an Anthroposophy Summer School organised by Eleanor Merry. The Oxford Conference and the Torquay teacher training led to the founding of the first Waldorf schools in Britain. During Steiner's lifetime, schools based on his educational principles were also founded in Hamburg, Essen, The Hague and London; there are now more than 1000 Waldorf schools worldwide. Biodynamic agriculture In 1924, a group of farmers concerned about the future of agriculture requested Steiner's help. Steiner responded with a lecture series on an ecological and sustainable approach to agriculture that increased soil fertility without the use of chemical fertilizers and pesticides. Steiner's agricultural ideas promptly spread and were put into practice internationally and biodynamic agriculture is now practiced in Europe, North America, South America, Africa, Asia and Australasia.Groups in N. America, List of Demeter certifying organizations, Other biodynamic certifying organization, Some farms in the world A central aspect of biodynamics is that the farm as a whole is seen as an organism, and therefore should be a largely self-sustaining system, producing its own manure and animal feed. Plant or animal disease is seen as a symptom of problems in the whole organism. Steiner also suggested timing such agricultural activities as sowing, weeding, and harvesting to utilize the influences on plant growth of the moon and planets; and the application of natural materials prepared in specific ways to the soil, compost, and crops, with the intention of engaging non-physical beings and elemental forces. He encouraged his listeners to verify such suggestions empirically, as he had