cruelty to animals is contrary to man's duty to himself, because it deadens in him the feeling of sympathy for their sufferings, and thus a natural tendency that is very useful to morality in relation to other human beings is weakened.
Ecology more important than saving animals from slavery??? Humans suffer the raping of the earth but animals suffer DOUBLY: the raping of the earth PLUS their own raping by humans. They are innocent/they are not the ones who raped the earth/they enrich it for us all from the tiniest microscopic beings to the largest ones.
Let's stick to the practical and the concrete: Would you like it if people lived in a virtual world? If machines were smarter than people? If, in the future, people, animals and plants were products of technology? If you don't like these ideas, then for you the computer and biological sciences clearly are dangerous.
In the relations of man with the animals, with the flowers, with all the objects of creation, there is a whole great ethic, scarcely perceived as yet, which will at length break through into the light, and which will be the corollary and the complement to human ethics.
Often and often afterwards, the beloved Aunt would ask me why I had never told anyone how I was being treated. Children tell little more than animals, for what comes to them they accept as eternally established.
In shape they were like horrible toads, and moved in a succession of springs, but in size they were of an incredible bulk, larger than the largest elephant. We had never before seen them save at night, and indeed they are nocturnal animals save when disturbed in their lairs, as these had been. We now stood amazed at the sight, for their blotched and warty skins were of a curious fish-like iridescence, and the sunlight struck them with an ever-varying rainbow bloom as they moved.
The higher animals get their teeth without pain or inconvenience. Man gets his through months and months of cruel torture; he will never get a set which can really be depended on 'till a dentist makes him one.