 He analysed the hair, skin, and eye colour of 6,758,827 schoolchildren to identify the Jews and Aryans.His findings, published in 1886 and concluding that there could be neither a Jewish nor a German race, were regarded as a blow to anti-Semitism and the existence of an "Aryan race".Virchow did not believe in the germ theory of diseases, as advocated by Louis Pasteur and Robert Koch.