514 



Presents. 



[Nov. 20, 



sionally, as a substance the absorption-spectrum of which is generally the 

 same as the radiation spectrum, while the metalloids are substances the 

 absorption-spectrum of which, generally, is not the same ? 



" In other words, in passing from a hot to a comparatively cold state, 

 the plasticity of these latter comes into play, and we get a new mole- 

 cular arrangement. Hence are we not justified in asking whether the 

 change from oxygen to ozone is but a type of what takes place in all 

 metalloids?" 



Presents received November 20, 1873. 



Transactions. 



Cambridge, IT. S. : — American Association for the Advancement of 

 Science. Proceedings of the Twentieth Meeting held at Indiana- 

 polis, Indiana, August 1871. 8vo. Cambridge 1872. 



The Association. 



Cherbourg : — Societe Rationale des Sciences Naturelles. Memoires, 

 Vol. in. Tome XVIL 8vo. Cherbourg 1855-73. Catalogue de 

 la Bibliotheque. 2 e partie liv. 1. 8vo. 1873. The Society. 



Copenhagen : — Academie Eoyale. Memoires. 5 e serie. Classe des 

 Sciences. Vol. IX. No. 8, 9; Vol. X. No. 1, 2. 4to. Classe des 

 Lettres. Vol. IV. No. 8. 4to. Kjdbenhavn 1872-73. Bulletin pour 

 1872 (Oversigt). No. 2. 8vo. The Academy. 



Dijon : — Academie des Sciences, Arts et Belles-Lettres. Memoires. 

 2 e serie. Tome XIV., XV., XVI. 1866-70. 8vo. Dijon 1868-71. 



The Academ} r . 



Dublin : — Boyal Irish Academy. Transactions. Vol. XXIV. Part 

 16, 17. Science. Vol. XXV. Part 1-4. 4to. 1870-73. Pro- 

 ceedings. Vol. VII., IX., X. Series 2. Vol. I. No. 2-8. 8vo. 

 1856-73. The Academy. 



Pribourg : — Societe Helvetique des Sciences Naturelles. Actes. 19, 

 20, 21 Aout 1872. 55 e Session. 8vo. 1873. The Society. 



Greneva : — Societe de Physique et d'Histoire Naturelle. Memoires. 

 Tome XXII., XXIII. Partie 1. 4to. Geneve 1873. The Society. 



Glasgow : — Philosophical Society. Proceedings. 1872-73. Vol. VIH: = 

 No. 2. 8vo. Glasgow 1873. The Society. 



Helsingfors : — Finska Vetenskaps-Societeten. Acta. Tomi V. fasc. 2 ; 

 T. VI., VII., VIII. 4to. 1861-67. Ofversigt af Vetenskaps-So- 

 cietetens Porhandlingar. 1. 1838-53 ; IV. 1856-57. 4to. V.-XIV. 

 8vo. 1857-72. Bidrag till Finlands Naturkannedom, Etno- 

 grafi och Statistik. Haftet 1-10. 8vo. 1857-64. Bidrag till 

 Kannedom om Pinlands Natur och Folk. Haftet 1, 4-19. 8vo. 

 1858-71. Portekning ofver Societetens Boksamling °r 1862. 8vo. 

 1862. The Society. 



