But Old Faithful partakes in a high degree of all these characteristics, and, in addition, has the invaluable quality of uniform periodicity of action.
The numbers in the fourth and fifth columns are not to be taken as indicating the correct duration or periodicityof eruptions.
The uniform periodicity of this geyser is its most wonderful and most useful characteristic.
The prevalent notion that geysers exhibit uniform periodicity of action, is erroneous.
We must now institute some inquiries as to the causes of the periodicity of the spots.
The determining cause of the periodicity may exist in the interior of the Sun, and may depend on circumstances which will for ever remain unknown to us.
We have a deep conviction that the conception of the idea of purification by blood had at first some connection with the natural issue of blood at the commencement of periodicity in the female.
Before the arrival of the time of periodicity the young girl is of very little account, and is not numbered as a member of the tribe.
Anything that interferes with periodicity in the human body interferes with vital functioning.
This principle of periodicity applies to exercises as well as to anything else.
There is a more marked tendency to periodicity in the spontaneous manifestations of sexual desire.
So that, it would seem, the greater periodicity of the instinct in the wild state, alike in animals and in man, is associated with greater violence of the manifestations when they do appear.
Periodicity of sexual manifestations is, indeed, less absolute in primitive man than in most animals, but it is still very often quite clearly marked.
Meyer, at Gottingen, has investigated the annual periodicity of thunder storms, while Carl Prohaska has made a statistical study of similar storms in the German and Austrian Alps.
Herschel's inquiries into the construction of the heavens strike the keynote of the first part; the discoveries of sun-spot and magnetic periodicity and of spectrum analysis determine the character of the second.
Most thinkers on this difficult subject provide a quasi-explanation of theperiodicity in question through certain assumed vicissitudes affecting internal processes;[500] Sir Norman Lockyer and E.
The manner in which this periodicitymanifested itself requires a word of explanation.
One of them has bigger amplitude than the other, or their periodicityis different.
If the periodicity of the autonomous movements coincides with the periodicity of the external stimulus, the resulting movement will be determined by algebraical summation; it will be very pronounced when the two effects are concordant.
Later in the season, the leaf becomes tuned, as it were, to the periodic variation of the environment; the automatic movements become suppressed, and the diurnal periodicity becomes deeply impressed on the organism.
Once in a while the pain exhibits a marked periodicity in its appearance.
The truly malarial form of calculus fever differs from the traumatic in its regular periodicity and the methodical sequence of the attacks, which occur in the order of an intermittent quotidian or tertian.
There are some further matters which require to be mentioned connected with the periodicityof eclipses.
It is possible that in other cases the apparent periodicity is due to the unavoidable errors of observation to which, owing to their diffused outline, the nuclei of comets are liable.
Periodicity may be recognized in two ways: observations during the apparition may show that the motion is in an elliptic and not in a parabolic orbit; or a comet may have been observed at more than one return.
How, then, in view of these numerous dates, can we attach so much importance to the periodicity of these showers?
The author of these pages has watched for many years, and, in view of all the facts, has concluded that the doctrine of periodicity (as held by present meteorologists) is not tenable.
In all probability the periodicity of activity is an expression of the habits of the mouse race rather than of the immediate influence of any environmental condition.
Her way of work was sustained and continuous, and out of harmony with the rhythmical periodicity of the female organization.
Moreover, she would not, or could not, make any more allowance for the periodicity of her organization than for the shape of her skeleton.
Education will draw the best out of each by adjusting its methods to the periodicity of one and the persistence of the other.
Apart from the operation of the physical Law of Periodicitywe should have no natural measures of Time.
Periodicity is to us less obvious in the inanimate world of molecular changes; yet it is in operation even there.
The operation of the Law of Periodicity is necessary to the measurement of Time.
But it is more especially in the natural motions of those so-called material masses which constitute our physical environment that Periodicity most eminently prevails.
Periodicity is the scientific name for the Harmony of the Spheres.
We all know with what periodicity everything in nature dances, and how the smallest flower is a marvel of recurring rhymes and rhythms, with perfume for a melody.
It is not impossible that the phenomena of seasonal periodicity in crimes may possess a real significance in relation to sexual periodicity.
Raciborski and Pouchet, who first established the regular periodicity of ovulation in mammals, identified heat and menstruation.
Under the influence of domestication, animals tend to lose the strict periodicity of the wild condition, and become apt for breeding at more frequent intervals.
The periodicity of a case of hemicrania has been studied in detail by D.
Periodicity has been noted in various disorders of nervous character.
A weeklyperiodicity is very definitely shown by A.
This periodicity is natural to the human mind, and it also has relations to profound social movements.
This is the nascent stage of periodicity to the slow normalization of which, during these few critical years, everything that interferes should yield.
Our requirements should be uniform, with no whim, mood, or periodicityof any sort about them.
Night follows day in a cycle that never fails, the seasons are repeated each year, and there is a periodicity in the lives of plants and animals that is manifested in growth, nutrition, mating and resting.
In the individuals of this group there is a periodicity to mood (rather than to emotions).
The discovery of a distinct eleven-year periodicity in the magnetic phenomena of the earth naturally led to investigations of similar periods in meteorology.
Lockyer has called attention to the fact that there seems to be a periodicity of about 35 years in solar activity, and that this corresponds with the Bruckner period.
In some cases the relation to sun-spot periodicity is open to debate; in others, the results are contradictory.
Meldrum, then Director of the Meteorological Observatory at Mauritius, first called attention to a sun-spot periodicity in rainfall and in the frequency of tropical cyclones in the South Indian Ocean.
This periodicity is not observed in all subjects, but most generally in those who suffer most.
Mr. Dawson Williams has announced in Nature the discovery in many susceptible persons of a periodicity in the effects that follow a sting.
It is based on a strange law of periodicity that after years of study I have found extremely accurate and wonderful in its meaning.
