The reference documents clearly state it in the first sentence. http://arduino.cc/en/Serial/Print
"Prints data to the serial port as human-readable ASCII text."http://arduino.cc/en/Serial/Println
"Prints data to the serial port as human-readable ASCII text followed by a carriage return character (ASCII 13, or '\r') and a newline character (ASCII 10, or '\n')."
Now, are you saying you don't understand that difference or you aren't seeing it in the serial monitor. If you aren't seeing it, run the command twice, back to back.