Solution : in this case, download the file on your pc, then open it.
You need Acrobat Reader
Temoignages :Your editor has been in trouble with his administration (2nd Editorial (completed on 1/29/2015)) and is now able to detail the correspondence, which has become free (temoignages #1 to 8 : #1, #2, #3, #4, #5, #6, #7, #8).
For more details go to my blog.
Warning : During some period (2017) this edition of Poudres & Grains was restricted to few PG articles. We have restaured the complete version; also, we have added the blog Defense-Pierre-Evesque. overblog, and the research profile of this past president of AEMMG.