"Go and get it and wish," cried his wife, quivering with excitement.
The old man turned and regarded her, and his voice shook. "He has been dead ten days, and besides he – I would not tell you else, but – I could only recognize him by his clothing. If he was too terrible for you to see then, how now?" (3.24)
Mr. White understands the way this whole wishing thing works, but he wishes Herbert back to life anyway – without specifying that the grave rot and physical disfigurement <em>not </em>be included in the package. This passage gets at our fears of death and dead people. Notice how Mrs. White's grief causes her to forget these fears.