plate opposite vol.2 p.261
caption from the list of plates:-
These two prints [one shown] illustrate the doctrine of grouping smaller animals, as sheep, goats, and deer. ...
If they be removed to a middle distance, as represneted in the other of these prints, the subordinate group is of less consequence; and still of less, the farther it recedes from the eye. The whole is only considered as one body, blended, as it were, and shadowed, or inlightened, with the ground: and it is enough, if regular, and disagreeable shapes are avoided.
... a last word on sheep.