Note 9 — Chapter XI
Reading edition
In a paper to be published in the Report of the Genetic Conference, Paris, 1911, Bellair states that he obtained some partially fertile hybrids in the cross N. sylvestris × tabacum. As to the various degrees of sterility in hybrids between Nicotiana species see Lock, R. H., Ann. Roy. Bot. Gardens. Peradeniya, IV, 1909, p. 195.