Doctor Moreau explains.
and there is still something in everything I do that defeats me, makes me dissatisfied, challenges me to further effort. Sometimes I rise above my level, sometimes I fall below it; but always I fall short of the things I dream. The human shape I can get now, almost with ease, so that it is lithe and graceful, or thick and strong; but often there is trouble with the hands and the claws,—painful things, that I dare not shape too freely. But it is in the subtle grafting and reshaping one must needs do to the brain that my trouble lies. The intelligence is often oddly low, with unaccountable blank ends, unexpected gaps. And least satisfactory of all is something that I cannot touch, somewhere—I cannot determine where—in the seat of the emotions. Cravings, instincts, desires that harm humanity, a strange hidden reservoir to burst forth suddenly and inundate the whole being of the creature with anger, hate, or fear. These creatures of mine seemed strange and uncanny to you so soon as you began to observe them; but to me, just after I make them, they seem to be indisputably human beings. It’s afterwards, as I observe them, that the persuasion fades. First
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