Scope and content
H/1-H/14: Scientific correspondence. H/1-H/6 comprise principal correspondents, in alphabetical order; H/7-H/14 comprise shorter scientific correspondence, in chronological order.
H/15-H/36: General correspondence, mostly arranged in chronological order. H/32-H/35 comprise the contents of a folder inscribed 'Letters to JJ from distinguished people and others'; H/36 is a bundle of telegrams.