William Harvey

William
Harvey
1578
1657

English Physician, first to describe and detail blood circulatory system

Author Quotes

Doctrine once sown strikes deep its root, and respect for antiquity influences all men.

Restlessness and intermission from sleep grieved persons are molested with, whereby the blood is dried.

Even if this may take more than half an hour or an hour or a day for its accomplishment, it does nevertheless show that the beat of the heart is continuously driving through that organ more blood than the ingested food can supply, or all the veins together at any time contain.

Take a walk to refresh yourself with the open air, which inspired fresh doth exceedingly recreate the lungs, heart, and vital spirits.

Everyone admits that the male is the primary efficient cause in generation, as being that in whom the species or form resides, and they further assert that his genitures emitted in coitus causes the egg both to exist and to be fertile. But how the semen of the cock produces the chick from the egg, neither the philosophers nor the physicians of yesterday or today have satisfactorily explained, or solved the problem formulated by Aristotle.

The animal's heart is the basis of its life, its chief member, the sun of its microcosm; on the heart all its activity depends, from the heart all its liveliness and strength arise. Equally is the king the basis of his kingdoms, the sun of his microcosm, the heart of the state; from him all power arises and all grace stems.

I avow myself the partisan of truth alone.

The challenge prior to the court decision was deciding exactly what methods and approaches they could use ... Educating All of One Nation.

I just start singing, and it all comes back.

The examination of the bodies of animals has always been my delight; and I have thought that we might thence not only obtain an insight into the . . . mysteries of Nature, but there perceive a kind of image or reflex of the omnipotent Creator himself.

I profess to learn and to teach anatomy not from books but from dissections, not from the tenets of Philosophers but from the fabric of Nature.

The heart is the household divinity which, discharging its function, nourishes, cherishes, quickens the whole body, and is indeed the foundation of life, the source of all action.

I want a full and thorough investigation of this, and then we will issue the report publicly, ... We want to be transparent about this, and we are cooperating fully with the NCAA.

The heart of animals is the foundation of their life, the sovereign of everything within them, the sun of their microcosm, that upon which all growth depends, from which all power proceeds.

In attempting to discover how much blood passes from the veins into the arteries I made dissections of living animals, opened up arteries in them, and carried out various other investigations. I also considered the symmetry and size of the ventricles of the heart and of the vessels which enter and leave them (since Nature, who does nothing purposelessly, would not purposelessly have given these vessels such relatively large size). I also recalled the elegant and carefully contrived valves and fibres and other structural artistry of the heart; and many other points. I considered rather often and with care all this evidence, and took correspondingly long trying to assess how much blood was transmitted and in how short a time. I also noted that the juice of the ingested food could not supply this amount without our having the veins, on the one hand, completely emptied and the arteries, on the other hand, brought to bursting through excessive inthrust of blood, unless the blood somehow flowed back again from the arteries into the veins and returned to the right ventricle of the heart. In consequence, I began privately to consider that it had a movement, as it were, in a circle.

There is a lust in man no charm can tame: Of loudly publishing his neighbor's shame: On eagles wings immortal scandals fly, while virtuous actions are born and die.

In man, then, let us take the amount that is extruded by the individual beats, and that cannot return into the heart because of the barrier set in its way by the valves, as half an ounce, or three drachms, or at least one drachm. In half an hour the heart makes over a thousand beats; indeed, in some individuals, and on occasion, two, three, or four thousand. If you multiply the drachms per beat by the number of beats you will see that in half an hour either a thousand times three drachms or times two drachms, or five hundred ounces, or other such proportionate quantity of blood has been passed through the heart into the arteries, that is, in all cases blood in greater amount than can be found in the whole of the body. Similarly in the sheep or the dog. Let us take it that one scruple passes in a single contraction of the heart; then in half an hour a thousand scruples, or three and a half pounds of blood, do so. In a body of this size, as I have found in the sheep, there is often not more than four pounds of blood.

This organ deserves to be styled the starting point of life and the sun of our microcosm just as much as the sun deserves to be styled the heart of the world. For it is by the heart's vigorous beat that the blood is moved, perfected, activated, and protected from injury and coagulation. The heart is the tutelary deity of the body, the basis of life, the source of all things, carrying out its function of nourishing, warming, and activating body as a whole. But we shall more fittingly speak of these matters when we consider the final cause of this kind of movement.

In the above sort of way, by calculating the amount of blood transmitted [at each heart beat] and by making a count of the beats, let us convince ourselves that the whole amount of the blood mass goes through the heart from the veins to the arteries and similarly makes the pulmonary transit.

Toil of the mind destroys health by attracting the spirits from their task of concoction to the brain; whither they carry along with them clouds of vapours and excrementitious humours.

It helps us to maintain one of the things we are proud of -- reserves... Regardless of how many hurricanes hit us, and we were hit with several last year, we have managed to maintain our reserves. I think one of the things a city has to do is to maintain itself, not only operate in the black daily, but (remain) in the black when you hit your reserves.

Very many maintain that all we know is still infinitely less than all that still remains unknown.

It is, however, an argument of no weight to say that natural bodies are first generated or compounded out of those things into which they are at the last broken down or dissolved.

We try to run a clean program, so we consider any violation \'serious' if it's proven to be true, ... But right now, these are just allegations. The committee will meet with the NCAA to determine the number of possible violations and their nature.

Memory cannot exist without endurance of the things perceived, and the thing perceived cannot remain where it has never been.

Author Picture
First Name
William
Last Name
Harvey
Birth Date
1578
Death Date
1657
Bio

English Physician, first to describe and detail blood circulatory system