8 Library. [Jan. 



Cug S0O3 NagSgOg 2CuS : as given by Kessel. TLey also find that the 

 above double thiosulphate when treated with caustic soda yields cuprous 

 oxide, which again is soluble in excess of sodium thiosulphate. When 

 this solution is boiled cuprous sulphide is precipitated. The acid 

 cuprous thiosulphate could not be obtained by the action of sodium 

 thiosulphate on a concentrated solution of copper sulphate as mentioned 

 by Yon Hauer. 



The yellow salt described above dissolves easily in dilute hydro- 

 chloric acid. On adding concentrated hydrochloric acid or acetic acid 

 to this solution, a perfectly white stable salt is obtained conforming to 

 the formula 9CU2S2O3 5Na2S203 8NaCl I2H2O and not SCuaSgOs 2Na2 

 SgOg 4NaCl 8H2O as claimed by Siewert. 



The authors also obtained a faintly yellowish white salt of the 

 composition CugSgOg NagSgOg 2J HgO by an altogether different method 

 from that of Russel. 



The paper will be published in full, in the Journal^ Part II. 



9. An annotated List of the Butterflies of the Ke Isles. — By Lionel de 

 Nic^viLLE, F.E.S., C.M.Z.S., Sfc, and Heineich Kuhn. 

 The paper will be published in the Journal^ Part II, 



h 



IBRARY. 



The following additions have been made to the Library since the 

 meeting held in December last: — 



Transactions, Proceedings and Journals, 

 presented by the respective Societies and Editors. 



Amsterdam. Koninklijke Akademie van Wetenschappen,— Jaarboek, 

 1896. 



■ • . Verslagenen Mededeelingen, Afdeeliug Letterkunde, 



3<ie Reeks, Deel XII. 



■ ' . Afdeeling Natunkunde, Deel V. 



. — — . Verhandelingen, Eerste Sectie, Deel V, Nrn. 4-8 ; 



Tweede Sectie, V, 3-10. 

 Baltimore. Johns Hopkins University, — Circulars, Vol. XVII, IsTos. 



132 and 133. 

 Berlin, Berliner Entomologische Zeitschrift, — Band XLII, Heft 1 und 2. 

 — — . Gesellschaft Naturforschender Freunde zu Berlin, — Sitzungs- 



berichte, 1896. 



