I think some of NealParrs comments above are extremely misleading about this source The age of the Langmuir reference is irrelevant because Park only uses the Langmuir reference to define pathological science Then Park writing in  after all the research from the s all the criticism to come after and all the changes made by parapsychologists in response to criticism argues that the term still applies to parapsychology at the time he is writing NealParrs comment that Park is being unfair is just NealParrs opinion Shoemakers Holiday is correct as usual that the source cannot be used for the opinions of multiple scientists but it is a notable general and recent criticism