Lewis on Vivisection

Now I take it that when we understand a thing analytically and then dominate and use it for our own convenience we reduce it to the level of 'Nature' in the sense that we suspend our judgements of value about it, ignore its final cause (if any), and treat it in terms of quantity. . . . something has to be overcome before we can cut up a dead man or a live animal in a dissecting room.
The Abolition of Man, 1947, New York: Macmillan Publishing Co., Inc., 1974, p. 81.

It is not the greatest of modern scientists who feel most sure that the object, stripped of its qualitative properties and reduced to mere quantity, is wholly real. Little scientists, and little unscientific followers of science may think so. The great minds know very well that the object, so treated, is an artificial abstraction, that something of its reality has been lost.
The Abolition of Man, 1947, New York: Macmillan Publishing Co., Inc., 1974, p. 82.

It is the rarest thing in the world to hear a rational discussion of vivisection. Those who disapprove of it are commonly accused of 'sentimentality', and very often their arguments justify the accusation. They paint pictures of pretty little dogs on dissecting tables. But the other side lie open to exactly the same charge. They also often defend the practice by drawing pictures of suffering women and children whose pain can be relieved (we are assured) only by the fruits of vivisection.
"Vivisection," God in the Dock, ed. Walter Hooper, Grand Rapids, MI: William B. Eerdmans Publishing Company, 1970, p. 224.

Now vivisection can only be defended by showing it to be right that one species should suffer in order that another species should be happier.
"Vivisection," God in the Dock, ed. Walter Hooper, Grand Rapids, MI: William B. Eerdmans Publishing Company, 1970, p. 225.

They [the majority of vivisectors] are most of them naturalistic and Darwinian. Now here, surely, we come up against a very alarming fact. The very same people who will most contemptuously brush aside any consideration of animal suffering if it stands in the way of 'research' will also, on another context, most vehemently deny that there is any radical difference between man and the other animals. On the naturalistic view the beasts are at bottom just the same sort of thing as ourselves. Man is simply the cleverest of the anthropoids.
"Vivisection," God in the Dock, ed. Walter Hooper, Grand Rapids, MI: William B. Eerdmans Publishing Company, 1970, p. 226.

The victory of vivisection marks a great advance in the triumph of ruthless, non-moral utilitarianism over the old world of ethical law; a triumph in which we, as well as animals, are already the victims, and of which Dachau and Hiroshima mark the more recent achievements.
"Vivisection," God in the Dock, ed. Walter Hooper, Grand Rapids, MI: William B. Eerdmans Publishing Company, 1970, p. 228.

You will notice I have spent no time in discussing what actually goes on in the laboratories. We shall be told, of course, that there is surprisingly little cruelty. That is a question with which, at present, I have nothing to do. We must first decide what should be allowed: after that it is for the police to discover what is already being done.
"Vivisection," God in the Dock, ed. Walter Hooper, Grand Rapids, MI: William B. Eerdmans Publishing Company, 1970, p. 228.