diff --git a/books/bookvol0.pamphlet b/books/bookvol0.pamphlet
index be3d288..4509806 100644
--- a/books/bookvol0.pamphlet
+++ b/books/bookvol0.pamphlet
@@ -1642,7 +1642,7 @@ Given that we can define expressions involving symbols, how do we actually
 compute the result when the symbols are assigned values? The answer is to
 use the {\bf eval} function which takes an expression as its first argument
 followed by a list of assignments. For example, to evaluate the expressions
-{\bf XDummy} and {\bf xyDummy} resulting from their respective assignments 
+{\sl xDummy} and {\sl xyDummy} resulting from their respective assignments 
 above we type:
 
 \spadcommand{eval(xDummy,x=3)}
diff --git a/books/bookvol1.pamphlet b/books/bookvol1.pamphlet
index 5281098..2962c4e 100644
--- a/books/bookvol1.pamphlet
+++ b/books/bookvol1.pamphlet
@@ -2166,7 +2166,7 @@ Given that we can define expressions involving symbols, how do we actually
 compute the result when the symbols are assigned values? The answer is to
 use the {\bf eval} function which takes an expression as its first argument
 followed by a list of assignments. For example, to evaluate the expressions
-{\sl XDummy} and {\sl xyDummy} resulting from their respective 
+{\sl xDummy} and {\sl xyDummy} resulting from their respective 
 assignments above we type:
 
 \index{eval}