The American Journal of Science and Arts

Передня обкладинка
S. Converse, 1869
0 Рецензії/відгуки
Google не перевіряє відгуки, але виявляє та вилучає неправдивий контент

Відгуки відвідувачів - Написати рецензію

Не знайдено жодних рецензій.


Інші видання - Показати все

Загальні терміни та фрази

Популярні уривки

Сторінка 53 - There is grandeur in this view of life, with its several powers, having been originally breathed by the Creator into a few forms or into one; and that, whilst this planet has gone cycling on according to the fixed law of gravity, from so simple a beginning endless forms most beautiful and most wonderful have been, and are being evolved.
Сторінка 270 - Annual Report of the Trustees of the Museum of Comparative Zoology, at Harvard College, in Cambridge, together with the Report of the Director, 1867.
Сторінка 46 - In North America the black bear was seen by Hearne swimming for hours with widely open mouth, thus catching, like a whale, insects in the water. Even in so extreme a case as this, if the supply of insects were constant, and if better adapted competitors did not already exist in the country, I can see no difficulty in a race of bears being rendered, by natural selection, more and more aquatic in their structure and habits, with larger and larger mouths, till a creature was produced as monstrous as...
Сторінка 47 - ... of the year when food was scarcest; they would also rear more young, which would tend to inherit these slight peculiarities. The less fleet ones would be rigidly destroyed. I can see no more reason to doubt that these causes in a thousand generations would produce a marked effect, and adapt the form of the fox or dog to the catching of hares instead of rabbits, than that greyhounds can be improved by selection and careful breeding.
Сторінка 51 - Not one hour old, yet of sciential brain To unperplex bliss from its neighbour pain ; Define their pettish limits, and estrange Their points of contact, and swift counterchange ; Intrigue with the specious chaos, and dispart Its most ambiguous atoms with sure art ; As though in Cupid's college she had spent Sweet days a lovely graduate, still unshent, And kept his rosy terms in idle languishment.
Сторінка 51 - So, being unable to accept the volitional hypothesis, or that of impulse from within, or the selective force exerted by outward circumstances, I deem an innate tendency to deviate from parental type, operating through periods of adequate duration, to be the most probable nature, or way of operation, of the secondary law, whereby species have been derived one from the other.
Сторінка 3 - Some augmened the number of loud reports, and terror and imagination seem, in various instances, to have magnified every circumstance of the phenomenon. The only thing which seemed of any importance beyond this statement, was derived from Mr, Elihu Staples, who said, that when the meteor disappeared, there were apparently three successive efforts or leaps of the fireball, which grew more dim at every throe, and disappeared with the last.
Сторінка 52 - A purposive route of development and change, of correlation and interdependence, manifesting intelligent Will, is as determinable in the succession of races as in the development and organization of the individual. Generations do not vary accidentally, in any and every direction ; but in preordained, definite, and correlated courses.
Сторінка 256 - ... they are parallel with the longer sides. Often these lines do not reach the middle of the figure, where only a confused crystallization can be detected. In the interior of the elongated figures the lines are quite irregular, often running together and showing a striking resemblance to woody fiber. The nature of these markings may be easily understood. They indicate the axes of minute columnar crystals, which tend to assume a position at right-angles to the surface of cooling.
Сторінка 135 - It has been shown that finely divided gold is soluble in the sesquichlorid of iron and, more sparingly, in the sesquisulphate of that metal. It is also well known that iron pyrites sometimes results from the action of reducing agents on the sulphates of that metal. If therefore sulphate of iron, in a solution containing gold, should become transformed by the action of a reducing agent into pyrites, the gold at the same time being reduced to the metallic state, would probably be found enclosed in...

Бібліографічна інформація