The statistical studies of physical defects in the schools reveal almost universally a positive relationship between school retardation and possession of adenoids and diseased tonsils.
The correlation between pedagogical retardation and percentage of defect in each group was as follows: Defects Retardation 1 yr.
It is conceivable that pedagogical retardation might exist without any defect of intelligence.
Since there was no recuperation in intelligence resulting from operation for adenoids and tonsils, it is reasonable to expect that there had been no retardation from which to recuperate.
Thus mechanical irritation, such as friction or wound, induces a retardation of growth (p.
The second record shows that the latent period is reduced to 4 seconds, and a relatively greater retardation of growth was induced by the action of the stronger stimulus.
The former induces a retardation and the latter an acceleration of growth.
Growing organs in sub-tonic condition responds to stimulus by abnormal acceleration of rate of growth, which is converted into normal retardation under continuous stimulation.
The contractile effect of light is seen not only in the retardation of growth, but also by the characteristic modification of pulsation of Desmodium in the diminution of diastolic limit of expansion.
Stimulus of moderate intensity induces in the same tissue the normal retardation of growth.
Stimulus by contact or friction induces a retardation which is, relatively speaking, moderate.
A diminution or negative variation of turgor induces a fall or negative response of the leaf of Mimosa, and a negative variation or retardation of the rate of growth.
The continued effect of light of moderate intensity in bringing about increasing retardation of growth will be seen in Fig.
Proceeding further in the infra-red region of thermal rays, it is found that these latter rays become suddenly effective in inducing retardation of growth.
Response was induced within 10 seconds, the maximum retardation being one-sixth of the normal rate (Fig.
In normal tonic condition the effect induced is the very opposite, light causing an arrest of pulsation and retardation or arrest of growth.
I have referred to the fact previously demonstrated, that while Direct stimulus induces contraction and retardation of growth, moderate rise of temperature induces the opposite effect of expansion and acceleration of growth.
As the current is the positive source of all the movements of the bodies, and is in no way responsible for the retardation of some boats, so God is the source only of activities,--the perfections of his creatures.
The amount of retardation of anything, as of a valve in a steam engine, in opening or closing.
A rather strange notion in mechanics where there is no provision made for acceleration or retardation of rotation.
As will be seen in the next chapter, a retardation in the period of spring has been observed in numerous localities in Southern Europe, as well as in the United States.
With respect to the retardation of the atmospheric currents, and the effects of that retardation, one of my illustrious colleagues, M.
Plane-rotation necessitates a radical change in the absolute motion of each individual particle, electron, atom or molecule of matter in the cube and a consequent retardation or acceleration of this motion.
So far as the admission and exhaust valves are concerned, the wearing of the cams, rollers, and lever-pivots is evidenced by a retardation in the opening of these valves and an acceleration in their closing.
The retardation will be greater as the tube is shorter, and vice versa.
Retardation is effected by moving the burner away from the base.
Acceleration of development, Cope and Hyatt onretardation and.
In a paper "On the Tidal Retardation Argument for the Age of the Earth" ("Brit.
Any dangerous acceleration of the cage causes the inertia of these parts to produce a retardation relative to the car which throws into action a brake or a catch, and thus controls the motion within safe limits or breaks the fall.
It was suggested that the whole of the retardationmight be owing to these causes.
The retardation in a telegraphic cable, on the contrary, is proportional to the length of the conducting-wire and the intensity of the battery.
I have alluded to the resistance offered by the conductor of a telegraph-cable to the passage of an electric current, and to the retardation of this current by static induction.
The use of submarine or of subterranean conductors occasions, from the above cause, a small retardation in the velocity of the transmitted electricity.
The retardation which resulted from the intense current generated by two hundred cells will be also proportionately reduced in the comparatively small battery of forty cells.
It was mainly owing to the retardation from this cause that communication through the Atlantic cable was so exceedingly slow and difficult.
Our great astronomer, Adams, however, appears to have found a flaw in Laplace's calculation, and to have shown that only half the observed retardation could be accounted for in the way he had suggested.
The effect of a different distribution of land and water in modifying the retardation caused by tidal friction, and of reducing it, under some circumstances, to a minimum, does not appear to be taken into account.
Dufour suggests that the retardation of the earth (which is hypothetically assumed to exist) may be due in part, or wholly, to the increase of the moment of inertia of the earth by meteors falling upon its surface.
Laplace, therefore, laid the responsibility of the acceleration upon the moon, and if his views were correct, the tidal retardation must either be insignificant in amount, or be counteracted by some other agency.
Third hypothesis to explain transparency, and theretardation which Light suffers.
In other words, the retardation is proportional to the product of the resistance of the copper conductor and the total capacity of the cable.
The argument therefore from tidal retardation would cut down the time available for geological and biological changes to something not much more than one hundred million years, perhaps to less.
Retardation of the putrefactive process has been noticed in bodies some years under water.
The question of retardation of labor, like that of premature birth, is open to much discussion, and authorities differ as to the limit of protraction with viability.
The retardation of putrefaction of the body after death sometimes presents interesting changes.
Albinism is characterized by the absolute or relative absence of pigment of the skin, due to an arrest, insufficiency, or retardation of this pigment.
The higher self-induction of one circuit produces a greater retardation or lag in the current therein than in the other.
An important result secured by the construction shown here is that these coils which are designed to have the higher self-induction are almost completely surrounded by iron, and that the retardation is thus very materially increased.
The current generated in the secondary coil will react upon the primary current, modifying the retardation of the same, according to the amount of self-induction and resistance in the secondary circuit.
The question is, therefore, whether the retardation of down-cutting here experienced by the Anthracite was sufficient to allow the capture of its headwaters by the Susquehanna.
The average percentage of retardation for the city as a whole was 40.
Retardation in the Elementary Schools of Philadelphia," Psych.
In practice of course, students of retardation test children by standardized scales.
Olbers subsequently adopted this opinion of the gradual retardation of the November phenomenon.
It is a striking instance of the beauty of that 'acceleration and retardation of true verse' which Coleridge speaks of.
A retardation of the date at which the quota can be filled is a direct indication of the degree of exhaustion of the hauling grounds.
Toroidal:--Another type of retardation coil, called the toroidal type due to the fact that its core is a torus formed by winding a continuous length of fine iron wire, is shown in diagram in Fig.
No trace of the retardation poleward from the equator, shown by the spots, could be detected in their movements.
Faye preferred to consider it a retardation produced by ascending currents continually left behind as the sphere widened in which the matter composing them was forced to travel.
Thus the comet predicted by Klinkerfues and discovered by Pogson had already lagged to the extent of twelve weeks, and we shall meet instances farther on where the retardation is counted, not by weeks, but by years.
This may be regarded either as an acceleration increasing from the poles to the equator, or as a retardation increasing from the equator to the poles, according to the rate of revolution we choose to assume for the unseen nucleus.
Their upshot was to confirm and widen the law of retardation with increasing latitude derived from the progressive motions of spots.
The reason of this spreading-out or "dispersion" is that the various colours have different wave-lengths, and consequently meet with different degrees of retardation in traversing the denser medium of the prism.
