In 1847, Pfander published a treatise called HALL UL ISHKÂL, or Solution of
  Difficulties; being a reply to KASHF UL ASTÂR and KITÂB I ISTIFSÂR
  The Kashf ul Astâr has already been noticed at some length in this
  Review. Pfander's rejoinder is brief and pertinent. It is followed by a
  translation of the remarks on the Kashf ul Astâr which appeared in
  this Review. Then follow ten questions put to Pfander by a Maulvi Syad
  Abdallah Sabzwari of Lucknow, with their replies.1 After these
  comes the reply to Ali Hassan's Kitâb i Istifsâr, the work we have
  just been reviewing. The chief points of the Maulvi's desultory attacks are
  ably noticed and well refuted. The book concludes with the whole
  correspondence which passed between Pfander and Ali Hassan, and which has been
  previously described in the article referred to above. Dr. Pfander has not,
  since the publication of this volume, entered into any further written
  discussions with the Mohammedans. But although this