The implausibility of Mendel's theory before 1900

Attention is paid to the category of the plausibility of Mendel's terminology in formulating the research problem, in describing experimental model and research method and in explaining his theory in the historical context of the long lasting enigma of generation, hybridization and heredity. The new research problem of heredity derived from the enigma of generation was plausible for the sheep breeders in Brno in 1836-1837 who also formulated the research question: what and how is inherited? But they did not find an approach to the experimental investigation. Later in 1852 the research problem of heredity was formulated by the physiologist of the Göttingen University, R. Wagner, who also outlined the method of crossing animals or artifical fertilization of plants for the investigation of the enigma of generation and heredity. But he could not carry out the recommended experiments at the University. His proposal remained without echo. Mendel first mentioned the motivation for his research arising from plant breeding experience and then from the experiments with plant crossing by botanists. He delivered his lectures in Brno to the community of naturalists, who paid attention to the appearance of hybrids in nature, but were not interested in plant breeding. After describing research model and experimental method Mendel presented the sequence of hypotheses proved in experiments and explained the origin and development of hybrids and at the same time also the mechanism of fertilization and of transmission of traits, what was heredity without using the term. The listeners of his lectures and later the readers of his paper did not understand his explanation. ...