Handbook of flower pollination : based upon Hermann Müller's work ʻThe fertilisation of flowers by insectsʼ / by Dr. Paul Knuth ; translated by J.R. Ainsworth Davis.

Licence: Public Domain Mark

Credit: Handbook of flower pollination : based upon Hermann Müller's work ʻThe fertilisation of flowers by insectsʼ / by Dr. Paul Knuth ; translated by J.R. Ainsworth Davis. Source: Wellcome Collection.