48 REPORT 1860. 



Table III Experiment on the same Beam with a load equivalent to 



two-filths of the breaking weight. 



The beam broke after 5175 changes with a load equivalent to two-fifths of 

 the breaking weight, although with lesser weights it had appeared uninjured. 



Summary of Results. 



Since these experiments were made the beam has been repaired, and has 

 made 1,500,000 additional changes with a load equivalent to one-fourth of the 

 breaking weight without giving way. It would appear, therefore, that with a 

 load of this magnitude the structure undergoes no deterioration in its molecular 

 structure ; and provided a sufficient margin of strength is given, say from five 

 to six times the working load, there is every reason to believe, from the results 

 of the above experiments, that girders composed of good material and of 

 sound workmanship are indestructible so far as regards mere vibratory action. 



As the experiments on this important subject are still in progress, we hope 

 to bring the subject more in detail before the Association at its next Meeting. 



A Catalogue of Meteorites and Fireballs, from a.d. 2 to a.d. 1860. 

 By R. P. Greg, Esq., F.G.S. 

 1. This Catalogue is intended partly as a sequel to the Reports on Lumi- 

 nous Meteors, now continued for a series of years in the volumes of the British 

 Association Reports, and partly as a continuation, in a corrected and extended 

 form, of a Catalogue of Meteorites published by the author, in two papers 

 on the same subject, in the Numbers of the Philosophical Magazine and 

 Journal of Science for November and December 1854. 



2. The following works and periodicals have been consulted, viz. — Thom- 

 son's Meteorology, 1849 ; Transactions of the Royal Society; Nicholson's 

 Journal of Natural Philosophy; Thomson's Annals of Philosophy ; London, 

 Edinburgh, and Dublin Philosophical Magazine ; Brewster's Encyclopaedia, 

 article " Meteorite ; " Annual Register ; Journal of the Asiatic Society of 

 Bengal ; British Association Reports ; Proceedings of the Royal Irish 

 Academy ; Spurgeon's Annals of Electricity ; New Edinburgh Philosophical 

 Journal ; Partsch's, Shepard's, and Reichenbach's Catalogues of Meteorites; 

 R. Wolf's, Chladni's, Boguslawski's, Quetelet's, Baumhauer's, and Coulvier- 

 Gravier's Catalogues ; Dr. Clark's Thesis on Iron Meteoric Masses ; Poggen- 

 dorff's Annalen; Annales de Chimieetde Physique; Comptes Rendus; Trans- 

 actions of the Imperial Academy of Arts and Sciences of Vienna, 1859-60, 

 papers by W. Haidinger ; Transactions of the Royal Academy of Brussels ; 

 Quarterly Journals of the Natural History Society of Zurich, 1856; Die 

 Feuermeteore insbesondere die Meteoriten, &c, von Dr. Otto Buchner of 



