Vietnam or Thailand ? Vote for the TOP Country of the Week !
Updated: July 4, 2025
The systematists have placed them in this niche of the avicular scheme, not only because they are able to perch like other passeres on twigs and small branches, but also because they have the foot of the true perching bird, with three toes in front and one, well developed, in the rear.
It should be remembered that systematists are far from being pleased at finding variability in important characters, and that there are not many men who will laboriously examine internal and important organs, and compare them in many specimens of the same species.
Soon other volumes appeared, adding more species, and systematists everywhere have been describing new ones until now the total number of described species is probably over five hundred, more than sixty of which occur in the United States. This shows only one phase of the great interest that has been taken in the mosquitoes since the discovery of their importance as carriers of disease.
In this case the systematists formerly enumerated the alpine plants as forma alpestris, but whenever the intermediate is lacking the term Varietas alpestris was often made use of. It is simply impossible to decide concerning the real relation between the alpine and lowland types without experiments.
"The speculating systematists who decide about genera and species, by some slight protuberance upon a tooth have already created a wonderful confusion in the family of the goats.
As the presence of rudimentary organs is thus due to the tendency in every part of the organisation, which has long existed, to be inherited we can understand, on the genealogical view of classification, how it is that systematists have found rudimentary parts as useful as, or even sometimes more useful than, parts of high physiological importance.
If he had known enough of the science to partake of the fruit of the tree of life he might have lived long enough to write a systematic botany, satisfactory alike to the Harvard school of standpat systematists and their manual-ripping rivals in nomenclature. But he didn't; and no one else may ever hope to do it.
Other distinguishing marks are not recorded by the systematists, or are not so sharply separated as to allow of the corresponding qualities of the hybrids being compared with them. This hybrid remains true to the description given. In some years I cultivated two generations so as to be able to compare them with one another, but did not find any difference.
This is clearly shown by hybrids never having been raised between species ranked by systematists in distinct families; and on the other hand, by very closely allied species generally uniting with facility. But the correspondence between systematic affinity and the facility of crossing is by no means strict.
Wallace in the Linnean Journal, or when analogous views on the origin of species are generally admitted, we can dimly foresee that there will be a considerable revolution in natural history. Systematists will be able to pursue their labours as at present; but they will not be incessantly haunted by the shadowy doubt whether this or that form be in essence a species.
Word Of The Day
Others Looking