— CGXVIII — 



scheii Deutschen Akademie der Naturforscher. - Heft 

 n-i8. - Halle, 1881-82. 



London (The), Edinburgh and Dublin Philosophical Maga- 

 zine, and Journal of science.- Voi. 45, n. 94.- London, 

 Aprii 1883. 



F. R. S. Rayleigh. On Maintained Vibrations. — E. Pringsheim. On 

 a Measurement of Wavelengths in the Ultra-ied Region of the 

 Spectrum of the Sun. — E. Warburg. On effects of Retentive- 

 ness in the Magnetization of Irou and Steel. — Maxwell H. Clo- 

 se. On the Meaning of « Force ». — /. /. Sylvester. On the Num- 

 ber of Fractions contained in any « Farey Series » of which the 

 Limiting Number is given. — R. M. Bosanquet. On Permanent 

 Magnetism. — On Self-Regulating Dynamó-electric Machines. — 

 E. Yung. On the Errors of our Sensations : a Contribution to 

 the Study of lllusion and Hallucination. — W. F. Barrett. Note 

 on the Alleged Luminosity of the Magnetic Field. 



*Lund Universitets-Bibiiotek Accessions-Katalog - 1879-81. 

 Lund, 1880-82. 



Mathematische Ànnalen in Verbindung mit G. Neuniann, be- 

 griiodet durch R. F. A. Clebsch, etc. 



B. XI-XX. - Leipzig, 4 877-82. 

 .) XXI, h. 4-4. » 4 883. 



*Memoirs of the American Academy of Aris and Sciences. - 

 Voi. XI, p. I. - Cambridge, 1882. 



*Memoirs of the Boston Society of Naturai History- Voi. Ili, 

 n. 4-3. - Boston, 4 882. 



S. F. Clarke. Neu Hydioids from Chesapeake Bay. — S. H. Scudder. 

 Arcliipolypoda, a Subordinai Type of Spined Myriapods from the 

 Carboniferous Formation. 



*Mémoires de f Académie Imp. des sciences de SA Pclers- 

 bourg. - T. XXX, u. 6-1 1. - 4 882. 



W. Kiprijanoff. Uther die fossilen ReptiUen Russlaads. — B. Has- 

 sulberg. Ueber das zweite Spectrum des Wasserstoff. — H. Stru- 

 ve. Ueber dea Einlluss dei DiflVaelion an Fernróhren auf Licht- 



