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The code snippet for exercise 1.22 does not match the book’s. Here’s the original:


(define (timed-prime-test n)
  (newline)
  (display n)
  (start-prime-test n (runtime)))

(define (start-prime-test n start-time)
  (if (prime? n)
      (report-prime (- (runtime) start-time))))

(define (report-prime elapsed-time)
  (display " *** ")
  (display elasped-time))

I hope this does not get lost in spam.

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