It has been established experimentally in several kinds of animals that earlycleavage blastomeres when isolated can each develop into a complete individual.
Patterson has established the fact that cleavage of the egg takes place in the usual manner, but later separate centers of development appear in the early embryonic mass and give rise to the separate young individuals.
In the gloeocapsa, which forms a thin blue-green gelatinous deposit on damp walls and rocks, the constituent cytodes cover themselves immediately aftercleavage with a fresh gelatinous envelope, and these run together into large masses.
When the segmentation of a cell proceeds so rapidly that the transverse-cleavage follows immediately on the length-cleavage, and the two are at length made to coincide, twofold division is changed into fourfold division.
In the simplest case, the cell-cleavage of the monera, propagation (by simple transverse division) is clearly nothing more than transgressive growth.
This quiescent form is assumed by the bacterium if its supply of food is exhausted; if fresh food is added, the multiplication by cleavage begins again.
These are usually formed by the daughter-cells which arise from the cleavage of a mother-cell remaining united after the division, and so on with the succeeding generations which come from their repeated segmentation.
But in many of the lower animals and most of the plants we find also asexual multiplication, or monogony, by cleavage or budding.
The reproduction of the chromacea by simple cleavage is merely the continuation of this simple growth process, when it passes the limit of individual size.
Many generations of cells proceed by cleavage from the one stem-cell (the impregnated ovum) before two of these cells become sexually differentiated, and form a generation of sexual cells.
It is usually formed by a permanent association of histonals that are produced by cleavage (imperfect segmentation or budding) from one histonal individual.
There is a perfect cleavage parallel to the brachypinacoid, and less perfect cleavage parallel to the prism faces m.
The cleavage is of great help in distinguishing calcite from other minerals of similar appearance.
This lamellar twinning is of secondary origin; it may be readily produced artificially by pressure, for example, by pressing a knife into the edge of a cleavage rhombohedron.
Divisions had, however, set in, especially a cleavage into the Ghasi or vegetarian, and the Mansi or flesh-eating sections.
This is already an abnormal condition, a pathological state, and its severity depends upon the degree of cleavagebetween the streams of thought.
It is of a white or yellowish color, with pearly luster on the cleavage surface.
One of the cells or division formed by segmentation, as in egg cleavage or in fissiparous cell formation.
Defn: An orthorhombic mineral of the pyroxene group, of a grayish or greenish black color, often with a peculiar bronzelike luster (schiller) on the cleavage surface.
Quite frequently, however, the equality and regularity of cleavage is interfered with by the presence of food yolk, from which results unequal segmentation.
Defn: A toxic substance contained in the venom of poisonous snakes; also, a (supposedly identical) toxic substance obtained by the cleavage of an albumose.
Face of coal (Mining), the principal cleavage plane, at right angles to the stratification.
Defn: A mineral of the Zeolite family, often occurring in amygdaloid, in foliated masses, and also in monoclinic crystals with pearly luster on the cleavage face.
Defn: The property, possessed by some crystalline rocks, of dividing into plates or slabs, which is due to the cleavage structure of one of the constituents, as mica or hornblende.
Defn: Having a distinct cleavagein a single direction only.
And if in the vagueness of my thoughts I were to seek for illustration less general and vague to show the essence of this temperamental cleavage in all Art, I would take the two novelists Turgenev and Stevenson.
It occurs in many crystalline forms, of which the cleavage is a right rhomboidal prism.
Its texture is close, without perceptible cleavage or appearance of structure; the specific gravity of common lead is 11.
These lines of cleavage were emphasized as much as possible by the Tokugawa rulers.
Applied to a form of egg cleavage seen in osseous fishes, which occurs only in a small disk that separates from the rest of the egg.
Another controversy which was being carried on at intervals indicates the line of cleavage between the capitalist and the landed interest.
Belief in the Malthusian theory of population was the most essential article of their faith, and marked the line of cleavage between the two wings of the Radical party.
It is next important to remember that such a man as we are conceiving would never have regarded the legal distinctions between slave and free as a line of cleavage between different kinds of men.
Again they sought the line of cleavage between two armies, where differences of language and tactics made military cohesion difficult--between the British and the Portuguese on the Lille front.
Cleavage is the line of easiest separation in a mineral.
The members of society will take sides as this line of cleavage indicated by their several economic interests may decide.
In proof of this he showed experimentally that a mass of "pure white wax, after having been submitted to great pressure, exhibited a cleavage more clean than that of any slate-rock, splitting into laminae of surpassing tenuity.
Section in Lower Silurian slates of Cardiganshire, showing the cleavage planes bent along the junction of the beds.
The accompanying quartz, however, greatly predominates in quantity, but the most readycleavage is determined by the abundance of mica in certain parts of the dark layer.
Siberia, which possessed the cleavage and chemical composition of hornblende, while they had the external form of augite.
It is only when these are very coarse that the cleavage planes entirely vanish.
Most of the scales of mica occurring in certain slates examined by Mr. Sorby lie in the plane of cleavage; whereas in a similar rock not exhibiting cleavage they lie with their longer axes in all directions.
He has also called my attention to the fact that subsequent movements in a cleaved rock sometimes drag and bend the cleavage planes along the junction of the beds in the manner indicated in Figure 625.
Subsequently (1853) Mr. Sorby demonstrated the great extent to which this mechanical theory is applicable to the slate rocks of North Wales and Devonshire (On the Origin of Slaty Cleavage by H.
This cleavage is of much service in preparing the gem for cutting, as by taking advantage of it, broad, flat surfaces can be obtained without grinding.
One important property of crystallized Diamond is that of cleavage parallel to the faces of the octahedron.
The cleavage of the yolk is partial in the case of Birds and Reptiles, in Mammals it is total.
A), and then divided by repeated halvings into a large number of cells (exactly as in the case of the cleavage of the egg, Fig.
Its deadliest effect is the complete cleavage it introduces between religion and life.
Relation of cleavage and foliation to the lines of tension during metamorphosis.
Hardy Peninsula, and on the northern point of Wollaston Island; although in these two latter localities the cleavage has been much obscured by the metamorphosed and feldspathic condition of the slate.
The folia and cleavage of these rocks ranged between [N.
The cleavage was nearly vertical, striking in a N.
At the northern end of Quiriquina Island, in the Bay of Concepcion, at least eight rudely parallel dikes, which have been guided to a certain extent by the cleavage of the slate, occur within the space of a quarter of a mile.
Finally, we have seen that in the extreme eastern point of Tierra del Fuego, the cleavage and coast-lines extend W.
This latter instinct has died hard, considering the cleavage that various circumstances have created between the landed gentry and the peasantry.
We have seen how greatly modified the cleavage between the two peoples had by now become.
It accentuates in a striking manner the cleavage between the Eastern or the Latin Church, and that of the West and of the Welsh.
The class distinctions grew more rigid, and gradually, as the original racial line of cleavage was fused by intermarriage and the production of groups of varying status, these came to arrange themselves on a basis of occupation.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "cleavage" in a variety of sentences. We hope that you will now be able to make sentences using this word.
