"...But is there any reason why we should be suffered to torment them [Animals]? Not that any I can see...The day has been, I grieve to say in many places it is not yet past, in which the greater part of the species, under the denomination of slaves, has been treated by the law exactly upon the same footing, as, in England for example, the inferior races of animals are still."
January 1, 1970
https://en.wikiquote.org/wiki/Denomination