116764-01
Über einige aus künstlicher Befruchtung gewonnenen Hieracium-Bastarde. SS. (26)-31. - Und: Derselbe. Meteorologische Beobachtungen aus Mähren und Schlesien im Jahre 1869. SS. (131)-143. In: Verhandlungen des naturforschenden Vereins in Brünn. Band 8/1+2 in 1 Band.
Brünn, Selbstverlag, 1870. - (22,5 x 14,5 cm). XXII, 76, 144 S.; VII, 195 S. Mit 1 gefalteten lithographierten Tafel. Halbleinwandband der Zeit.
Zu I: Einzige Ausgabe dieser bedeutenden Arbeiten Mendels im Gefolge seiner berühmten, 1866 in der gleichen Zeitschrift veröffentlichten Abhandlung "Versuche über Pflanzen-Hybriden". - "After 1866, however, he published only a single short paper on 'Hieracium hybrids' (1869)... Mendel's experiments demonstrated that hybrids of 'Matthiola', 'Zea', and 'Mirabilis'... 'behave exactly like those of Pisum.' There still remained the question 'whether variable hybrids of other plant species show complete agreement in their behavior with hybrids of Pisum'... The genus 'Hieracium' (hawkweed) seemed to Mendel most suitable for solving this question... Mendel's 'Hieracium' research project was also connected with some taxonomical questions, since the transitional forms of a highly polymorphic genus like 'Hieracium' were very difficult to classify. The results of his four years' work, reported at the meeting of the Natural Sciences Society in Brno on 9 June 1869 and published in the society's 'Verhandlungen' in 1870, were disappointing. He had to admit that in his 'Hieracium' experiments 'the exactly opposite phenomenon seems to be exhibited' as compared with 'Pisum'. Subsequently, however, he carefully added that the whole matter 'is still an open question, which may well be raised but not as yet answered.' These experiments were extremely laborious and delicate because of the minuteness of the flowers and their particular structure; Mendel succeeded in obtaining only six hybrids, and only one to three specimens of each. Another obstacle was to be explained only in 1903: that 'Hieracium' reproduces partly by apogamy, so that in many instances offspring are not formed by cross-pollination and are all alike, as though derived from cuttings. Mendel discussed these experiments and the problems involved in more detail in his letters to Naegeli. The small number of 'Hieracium' hybrids he obtained did not allow any definite conclusion, and it is surprising that eventually he found the theoretical explanation even in this case. Notes in Mendel's handwriting brought to light only recently in the Mendelianum indicate that he insisted on his idea of variable hybrids and, assuming polygene action, he tried to explain that in 'Salix', as in 'Hieracium' a multifactor crossing takes place and that the segregation of their hybrids follows the same principle as in 'Pisum'. According to this assumption, the reported constancy exhibited by the extremely variable 'Hieracium' hybrids would be only apparent. Mendel centered his efforts on proving that a certain system operates in nature and that its laws could be formulated. It required a great capacity for abstraction and simplification of the extremely complex set of observed phenomena. He had to focus his attention on the main issues; otherwise he would have become lost in the complexities of nature, as had all his predecessors who found many isolated phenomena but did not synthesize them into a coherent system" (DSB). - Zu II: "Mendel began his meteorological studies in 1856 and was soon recognized as the only authority on this subject in Moravia... he summarized graphically the results of observations at Brno, using the statistical principle to compare the data for a given year with average conditions of the previous fifteen years" (DSB). - Titel mehrfach gestempelt. Vorsätze im Falz verstärkt. Einband etwas berieben, sonst wohlerhalten. - DSB 9, 277
Über einige aus künstlicher Befruchtung gewonnenen Hieracium-Bastarde. SS. (26)-31. - Und: Derselbe. Meteorologische Beobachtungen aus Mähren und Schlesien im Jahre 1869. SS. (131)-143. In: Verhandlungen des naturforschenden Vereins in Brünn. Band 8/1+2 in 1 Band.
Brünn, Selbstverlag, 1870. - (22,5 x 14,5 cm). XXII, 76, 144 S.; VII, 195 S. Mit 1 gefalteten lithographierten Tafel. Halbleinwandband der Zeit.
Zu I: Einzige Ausgabe dieser bedeutenden Arbeiten Mendels im Gefolge seiner berühmten, 1866 in der gleichen Zeitschrift veröffentlichten Abhandlung "Versuche über Pflanzen-Hybriden". - "After 1866, however, he published only a single short paper on 'Hieracium hybrids' (1869)... Mendel's experiments demonstrated that hybrids of 'Matthiola', 'Zea', and 'Mirabilis'... 'behave exactly like those of Pisum.' There still remained the question 'whether variable hybrids of other plant species show complete agreement in their behavior with hybrids of Pisum'... The genus 'Hieracium' (hawkweed) seemed to Mendel most suitable for solving this question... Mendel's 'Hieracium' research project was also connected with some taxonomical questions, since the transitional forms of a highly polymorphic genus like 'Hieracium' were very difficult to classify. The results of his four years' work, reported at the meeting of the Natural Sciences Society in Brno on 9 June 1869 and published in the society's 'Verhandlungen' in 1870, were disappointing. He had to admit that in his 'Hieracium' experiments 'the exactly opposite phenomenon seems to be exhibited' as compared with 'Pisum'. Subsequently, however, he carefully added that the whole matter 'is still an open question, which may well be raised but not as yet answered.' These experiments were extremely laborious and delicate because of the minuteness of the flowers and their particular structure; Mendel succeeded in obtaining only six hybrids, and only one to three specimens of each. Another obstacle was to be explained only in 1903: that 'Hieracium' reproduces partly by apogamy, so that in many instances offspring are not formed by cross-pollination and are all alike, as though derived from cuttings. Mendel discussed these experiments and the problems involved in more detail in his letters to Naegeli. The small number of 'Hieracium' hybrids he obtained did not allow any definite conclusion, and it is surprising that eventually he found the theoretical explanation even in this case. Notes in Mendel's handwriting brought to light only recently in the Mendelianum indicate that he insisted on his idea of variable hybrids and, assuming polygene action, he tried to explain that in 'Salix', as in 'Hieracium' a multifactor crossing takes place and that the segregation of their hybrids follows the same principle as in 'Pisum'. According to this assumption, the reported constancy exhibited by the extremely variable 'Hieracium' hybrids would be only apparent. Mendel centered his efforts on proving that a certain system operates in nature and that its laws could be formulated. It required a great capacity for abstraction and simplification of the extremely complex set of observed phenomena. He had to focus his attention on the main issues; otherwise he would have become lost in the complexities of nature, as had all his predecessors who found many isolated phenomena but did not synthesize them into a coherent system" (DSB). - Zu II: "Mendel began his meteorological studies in 1856 and was soon recognized as the only authority on this subject in Moravia... he summarized graphically the results of observations at Brno, using the statistical principle to compare the data for a given year with average conditions of the previous fifteen years" (DSB). - Titel mehrfach gestempelt. Vorsätze im Falz verstärkt. Einband etwas berieben, sonst wohlerhalten. - DSB 9, 277
6.500 €