 | 1859 - Страниц: 578
...the spring. In the majority of cases it is most difficult to imagine where the checks fall — though generally, no doubt, on the seeds, eggs, and young...from repeated casual observations what the average duration of life is, or to discover the different percentage of deaths to births in different countries,... | |
 | 1902 - Страниц: 584
...the spring. In the majority of cases it is most difficult to imagine where the checks fall — though generally, no doubt, on the seeds, eggs, and young;...from repeated casual observations what the average duration of life is, or to discover the different percentage of deaths to births in different countries,... | |
 | George Sarton - 1930 - Страниц: 636
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 | 1858 - Страниц: 478
...the spring. In the majority of cases it is most difficult to imagine where the checks fall, though generally, no doubt, on the seeds, eggs and young...from repeated casual observations what the average duration of life is, or to discover the different percentage of deaths to births in different countries,... | |
| George Sarton - 1930 - Страниц: 638
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 | Thomas Steele Hall - 1951 - Страниц: 746
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 | John Alexander Moore - 1957 - Страниц: 694
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 | Charles Darwin - 1959 - Страниц: 458
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In the majority of cases it is most difficult to imagine where the checks fall, though generally, no doubt, on the seeds, eggs and young ; but when we remember how impossible, even in mankind (so much better known than any other animal), it is to infer... 
