 | United States. Congress. House - 586 ページ
...At one period of the year they are oviparous; at another, viviparous; and what is most remarkable, the sexual intercourse of one original pair serves...proceed from the female for a whole succeeding year, before the spermatic virtue of the ancestral coitus is exhausted. It has been proved that, in five... | |
 | 1816 - 658 ページ
...descendants; the Noctua Gamma,ma.y in one season send forth 80,000 depredators into our gardens ; and Reaumur has proved that, in five generations, one Aphis may be the progenitor of 5,904,900,000 of its kind, and it is supposed that in one year there may be twenty generations ! Such an incalculable... | |
 | 1827 - 624 ページ
...agriculturist, and a most acute and accurate observer of nature, there maybe twenty generations in a year." Reaumur has proved that in five generations...may be the progenitor of 5,904,900,000 descendants. It may be objected to me here, that the aphis is a vivaporous insect, and that the experiments which... | |
 | Edward Bevan - 1827 - 444 ページ
...agriculturist, and a most acute and accurate observer of nature, there may be twenty generations in a year." Reaumur has proved that in five generations...may be the progenitor of 5,904,900,000 descendants. It may be objected to me here, that the aphis is a viviparous insect, and that the experiments which... | |
 | Gill's scientific, technological and microscopic repository - 1829 - 424 ページ
...they are viviparous, at another oviparous ; what is most remarkable and without parallel, the sexiufl intercourse of one original pair serves for all the...proceed from the female for a whole succeeding year ! Reamur has proved that, in five generations, an aphis may be the progenitor of 5,904,900,000 descendants;... | |
 | Georges baron Cuvier - 1832 - 998 ページ
...the slightest doubt of its truth, attested as it is by many witnesses worthy of the highest credit. Reaumur has proved, that in five generations one aphis may be the parent of 5,904,900,000 descendants. As soon as the aphides are born, they walk, and proceed to seek... | |
 | John Claudius Loudon - 1838 - 788 ページ
...water. The prodigious fecundity of the A'phis rosa; almost surpasses belief. " Reaumur has calculated that, in five generations, one aphis may be the progenitor of 5,904,900,000 descendants ; and in ordinary seasons, there are ten generations produced on rose bushes in the space of nine months."... | |
 | Henry Stephens - 1844 - 748 ページ
...has endued them with privileges for promoting fecundity, which no other insects possess : at one time of the year they are viviparous, at another oviparous...proceed from the female for a whole succeeding year. Beaumur has proved, that in 5 generations 1 aphis may be the progenitor of 5,904,000,000 descendants... | |
 | Cuthbert William Johnson - 1844 - 1210 ページ
...insect causes is not wonderful when we reflect on the astonishing fecundity of all the aphides family. The sexual intercourse of one original pair serves...all the generations which proceed from the female in the succeeding year; and Reaumur informs us, that, in five generalions, one aphis may be the progenitor... | |
 | 1848 - 910 ページ
...Providence has endued them with privileges promoting fecundity, which no other insects possess ; at one time of the year they are viviparous, at another oviparous...pair serves for all the generations which proceed (mm the female for a whole succeeding year. Reaumur has proved that in five generations one Aphis may... | |
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... and, what is most remarkable and without parallel, the sexual intercourse of one original pair serves for all the generations which proceed from the female for a whole succeeding year. 
