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OriginOfSpecies - 475 Rows
Column Type #Values Column Stats
id int(11) 475 Column Stats
subject varchar(80) 14 Column Stats
title varchar(250) 139 Column Stats
ordinal int(11) 30 Column Stats
description text 474 Column Stats

475 rows, page 51 of 119 (4/p)
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Export to Excel select * from OriginOfSpecies order by description desc limit 200, 4 (Page 51: Row)
subject
title
ordinal
description Desending Order (top row is last)
05 - Laws of Variation 05-11 - Species of the Same Genus Vary in an Analogous Manner 20 Many similar cases of analogous variation have been observed by Naudin in the great gourd-family, and by various authors in our cereals.

turgourdnip
turgourdnip

cereals
cereals


Similar cases occurring with insects under natural conditions have lately been discussed with much ability by Mr. Walsh, who has grouped them under his law of Equable Variability.

insect
insect

Benjamin Dann Walsh
Benjamin Dann Walsh


With pigeons, however, we have another case, namely, the occasional appearance in all the breeds, of slaty-blue birds with two black bars on the wings, white loins, a bar at the end of the tail, with the outer feathers externally edged near their basis with white.

As all these marks are characteristic of the parent rock-pigeon, I presume that no one will doubt that this is a case of reversion, and not of a new yet analogous variation appearing in the several breeds.

Rock Pigeon
Rock Pigeon


We may, I think, confidently come to this conclusion, because, as we have seen, these coloured marks are eminently liable to appear in the crossed offspring of two distinct and differently coloured breeds; and in this case there is nothing in the external conditions of life to cause the reappearance of the slaty-blue, with the several marks, beyond the influence of the mere act of crossing on the laws of inheritance.
14 - Recapitulation and Conclusion 14-02 - Recapitulation of the general and special circumstances in its favour 70 Many other facts are, as it seems to me, explicable on this theory.

How strange it is that a bird, under the form of woodpecker, should have been created to prey on insects on the ground; that upland geese, which never or rarely swim, should have been created with webbed feet; that a thrush should have been created to dive and feed on sub-aquatic insects; and that a petrel should have been created with habits and structure fitting it for the life of an auk or grebe! and so on in endless other cases.

woodpecker
woodpecker

insect
insect

Upland Goose
Upland Goose

thrush
thrush

petrel
petrel

auk
auk

grebe
grebe
02 - Variations Under Nature 02-03 - Doubtful Species 40 Many of the cases of strongly-marked varieties or doubtful species well deserve consideration; for several interesting lines of argument, from geographical distribution, analogical variation, hybridism, &c., have been brought to bear in the attempt to determine their rank; but space does not here permit me to discuss them.
01 - Variations Under Domestication 01-03 - correlation of Growth 10 Many laws regulate variation, some few of which can be dimly seen, and will hereafter be briefly discussed.

I will here only allude to what may be called correlated variation. Important changes in the embryo or larva will probably entail changes in the mature animal.

In monstrosities, the correlations between quite distinct parts are very curious; and many instances are given in Isidore Geoffroy St-Hilaire's great work on this subject.
Isidore Geoffroy Saint Hilaire
Isidore Geoffroy Saint Hilaire


Breeders believe that long limbs are almost always accompanied by an elongated head.

Some instances of correlation are quite whimsical: thus cats which are entirely white and have blue eyes are generally deaf;

but it has been lately stated by Mr. Tait that this is confined to the males.

Colour and constitutional peculiarities go together, of which many remarkable cases could be given amongst animals and plants.
From facts collected by Heusinger, it appears that white sheep and pigs are injured by certain plants, whilst dark-coloured individuals escape:

sheep
sheep

pig
pig