Autograph letter signed « L. Pasteur » [to professor Charles Bouchard]
Paris, 19th July 1888, 3 pages in-8° on laid paper
« Its immunity has been tested by inoculation on the surface of the brain »
Autograph letter signed twice, « Louis Pasteur » and « LP », to Comtesse Greffulhe
Paris, 20th February 1892, 2 pages squared in-8 on double sheet, Institut Pasteur letterhead.
“Think of the unnameable number of dogs which there would be to vaccinate in Paris !”
Autograph letter signed “L. Pasteur” to Pierre Viala
Paris, 30 May 1884, 1 p. in-8
« The greatest duration of immunity after vaccination was found in Melun »