Found the following hamletworks.org entries referring to line 38

View Material Textual Note for 37
37 That if againe this apparision come,1.1.28

View Commentary Note for 38
38 He may approoue our eyes and speake to it. 1.1.29

View Immaterial Textual Note for 38
38 He may approoue our eyes and speake to it. 1.1.29

View Material Textual Note for 38
38 He may approoue our eyes and speake to it. 1.1.29