Lost Horizon old, the doctor had told Rutherford, "Most old of anyone I have ever seen," implying that it was Lo-Tsen, aged drastically by her departure from Shangri-La. The narrator wonders whether Conway can find his way back to his lost paradise. The book, published in 1933, caught the notice of the public only after Hilton's "Goodbye, Mr. Chips" was published in 1934. "Lost Horizon" became a huge popular success and in 1939 was published in paperback form, as Pocket Book #1. Because of its number-one position in what became a very long list of pocket editions, "Lost Horizon" is often mistakenly
S-expression be formatted as pretty printed S-expressions using the function PPRINT (note: with two Ps, short for "pretty"-print). Lisp programs are valid s-expressions, but not all s-expressions are valid Lisp programs. codice_21 is a valid s-expression, but not a valid Lisp program, since Lisp uses prefix notation and a floating point number (here 1.0) is not valid as an operation (the first element of the expression). An S-expression preceded by a single quotation mark, as in codice_22, is syntactic sugar for a quoted S-expression, in this case codice_23. S-Expressions are often compared to XML, a key difference being that S-Expressions are