These difficulties and objections may be classed under the following heads:- Firstly, why, if species have descended from other species by insensibly fine gradations, do we not everywhere see innumerable transitional forms?
Yet reason tells me, that if numerous gradations from a perfect and complex eye to one very imperfect and simple, each grade being useful to its possessor, can be shown to exist; if further, the eye does vary ever so slightly, and the variations be inherited, which is certainly the case; and if any variation or modification in the organ be ever useful to an animal under changing conditions of life, then the difficulty of believing that a perfect and complex eye could be formed by natural selection, though insuperable by our imagination, can hardly be considered real.
In looking for the gradations by which an organ in any species has been perfected, we ought to look exclusively to its lineal ancestors; but this is scarcely ever possible, and we are forced in each case to look to species of the same group, that is to the collateral descendants from the same original parent-form, in order to see what gradations are possible, and for the chance of some gradations having been transmitted from the earlier stages of descent, in an unaltered or little altered condition.
In the Articulata we can commence a series with an optic nerve merely coated with pigment, and without any other mechanism; and from this low stage, numerous gradations of structure, branching off in two fundamentally different lines, can be shown to exist, until we reach a moderately high stage of perfection.
Seeing this gradation
and diversity of structure in one small, intimately related group of birds, one might really fancy that from an original paucity of birds in this archipelago, one species had been taken and modified for different ends.
Feng and Hao put forward a five-control-points design method for dense gradation
ATB, and the designed gradation
was close to the gradation
designed through CAVF method .
Given that the chord length index does not provide an accurate estimate of the air void content, an accurate estimate of the air void gradation
curve in concrete specimens is needed.
Disposable Absorbent Article Having A Color Gradation
Recyclers, HMA producers and agencies can now use this standard as a guide to carefully design shingles into the mix based on the RAS percent asphalt content, asphalt performance grade, aggregate gradation
and amount of deleterious materials.
* Flex Clear Drive technology achieves high density, smooth color gradation
expression by automatically analyzing the characteristics of the image and adjusting the distribution of color gradations
to optimize picture quality.
The achievements made during financial year 2018-19 included up gradation
of Basic Health Unit (BHU) Azakhel to Rural Health Centre (RHC) District Nowshera, up gradation
of BHU Mastung to RHC District Shangla, up gradation
of Civil Hospital (CH) Topi to Cat-C Hospital, Swabi, up gradation
of RHC Yar Hussain to Category-D Hospital, District Swabi, improvement and standardization of DHQ Hospital Batkhela Malakand, strengthening of THQ Hospital Drosh, Chitral, purchase of land for Gajju Khan Medical College Swabi, provision of balance funds in provincial share to scheme "Burns and Trauma Centre Peshawar, free treatment to 4672 poor cancer patients.