I. An Attempt to Prepare Antibodies to Histamine In Vitro. II. An Investigation of a Possible Method for Preparing Large Single Crystals of Aluminum Orthophosphate. III. Investigations of the Crystal Structures of Amino Acids by X-Ray Diffraction: A. An Investigation of the Space-Group and Lattice Constants of dl-Serine. B. An Investigation of the Crystal Structure of ℓ-Threonine