PUZZLE: The diary

• There are 4 envelopes marked A-B-C-D. You can use these to sort the pieces and store the completed pages. Clicking on a letter will open the envelop and you can take out, rearrange or use the pieces.
• When done, Jonathan summarizes his conclusions.
• The diary talks about two identical, dangerous meteorites.  Elekes-Tót had both. He tried to study them in vain, therefore he sent one of them to the Cambridge University in England to be examined there. Later he sold the second one to a mineral collector. This is the latest information about the whereabouts of the stones, dated middle of the 19th century (Elekes-Tót died in 1860).