.I M
in the same chain as
.IR J .
-Then, if there is currently no class pointer of type
-.IR Q ,
+If there is currently no class pointer
+for the chain headed by
+.IR J ,
then add a member
.RS
.IP
.B islots
structure within
.IR M 's
-class object.
+class object,
+where
+.I Q
+is the most specific superclass of
+.I M
+in the same chain as
+.IR J .
.RE
.hP \*o
Examine the superclass chains of