When the eye is trained to perceive pictorial effect, it is frequently struck by something�some combination of grouping, lighting and colour�that is seen to have that complete aspect of unity and beauty that to the artist's eye forms a picture. Such are the impressions that the artist-gardener endeavours to produce in every portion of the garden. Many of these good intentions fail, some come fairly well; a few reward him by a success that was beyond anticipation. When this is the case it is probably due to some cause that had been overlooked but that had chanced to complete his intention, such as the position of the sun in relation to some wished-for colour-picture. Then there are some days during the summer when the quality of light seems to tend to an extraordinary beauty of effect. I have never been able to find out how the light on these occasions differs from that of ordinary fine summer days, but, when these days come, I know them and am filled with gladness.
