Letters received,] 28 [May 6, 



Societe des Sciences do Finlande, Helsingfors, June 13th, 18C7 ; Soci^te Imperiale 

 Geographique de Russie, St-Petersbourg, July 23d, 1867; Societe Linnc^'ene de 

 Lyon, July 1st, 1867; Curateurs de I'Universite de Leyde, July 8d, 1867; K. 

 Akademie der Wissenschaften, Wien, July 2d, 1867; Societe de Physique et 

 d'Histoire Naturelle dc Geneve, July 15th, 1867; K. Oeffentliche Bibliothek, St. 

 Petersburg, July 18th, 1867; Royal Geographical Society, London, July 20tli, 

 1867; Societe d'Histoire Naturelle de Colmar, August 1st, 1867; Academic Lupe- 

 riale des Sciences, etc., do Lyon, August 1st, 1867; Soci^tc'' Imperiale d' Agri- 

 culture, d'Histoire Naturelle, etc., de Lyon, August 1st, 18G7; Natur- 

 forechende Gesellschaft, Freiburg, August 3d, 1867 ; K. Leopoldino-Carolinische 

 Deutsche Akademie der Naturforscher, Dresden, August 3d, 1867; Society 

 d'Histoire Naturelle de Colmar, August 5th, 1867; Mannheimer Verein fiir 

 Naturkunde, August 20th, 1867; Schlesische Gesellschaft flir vaterliindische 

 Cultur, Pireslau, August 20th, 1867; Universitas Carolina Lundensis, August 

 23d, 1867; Academic Royale des Sciences, etc., de Belgique, Bruxelles, Septem- 

 ber 5th, 1867; Naturforscher Gesellschaft, Dorpat, September 12th, 1867; Soci6t6 

 Scientifique de la Zelande k Jliddclbourg, October 20th, 1868; Senckenbergische 

 naturforschende Gesellschaft, Frankfurt am Main, November 1st, 1867 ; Societe 

 Linneene de Lyon, November 10th, 1867; Societe des Sciences Naturellesde Neu- 

 chatel, November 20th, 1867; K. Akademie der Wissenschaften, November 20th, 

 1867; K. Siichsische Gesellschaft der Wissenschaften, Leipzig, November 29th, 

 1867; Societe d' Agriculture, Sciences, etc., du Puy, Le Puy, 1867; Societe Hol- 

 landaise des Sciences a Harlem, Januaiy 12th, 1868 ; California Academy of Nat- 

 ural Sciences, San Francisco, January 13th, 1868; K. Gesellschaft der Wissen- 

 schaften zu Gottingen, February 16th, 1868; Akklimatisations- Verein in Berlin, 

 February 18th, 1868; Cercle Artistique, Litti^raire, et Scientifique d'Anvers, 

 February 24th, 1868; Chicago Academy of Sciences, March 23d, 1868, present- 

 ing their various publications. 



From the Verwaltungs-Ausschuss des Museums Francisco-Carolinum, Linz, 

 December 21st, 1866 ; Historischer Verein, Ansbach, April 20th, 1867, present- 

 ing their publications, and requesting an exchange. 



From the Deutsche geologische Gesellschaft, Berlin, May ISth, 1867, present- 

 ing its publications, and asking for the first volume of the Society's Proceedings. 

 " From the Verein von Alterthumsfreunden im Rheinlande, Bonn, May 14th, 

 1867, Royal Danish Society, Copenhagen, May 14th, 1867; Naturhistorischer 

 Verein, Dessau, January 10th, 1867, accepting the proposal to exchange, and 

 sending their publications to the Society. 



From the Society of Rural Economy of Southern Russia, Odessa, March 15th, 

 1867, accepting a proposal to exchange publications, and giving an account of 

 that Society. 



From the Philosophical and Literary and the Geological and Polytechnic 

 Societies of Leeds, September 17th, 1867, promising deficient numbers of their 

 publications to complete the Society's sets, as far as possible. 



From the Societe Imperiale des Sciences Naturelles de Cherbourg, October 

 19th, 1867, asking for certain numbers of the Society's publications. 



From Prof. Zantedeschi, Padova, November 28th, 1867, presenting a work, of 

 which he is the author, entitled, Intorno alia elettricila imhtta o (tinfluenza negli 

 strati aerei dell' atmosfera, che a forma di anello circondano una nube risohentesi 

 in pioggia, neve o grandine. 



