ON STEAMSHIP PERFORMANCE. 339 
extremity, and fig. 2 the crystallization near the middle of the rounded por- 
tion of the mass. The iron, especially at the pyramidal part, is very brittle: 
so much so, that no difficulty is experienced in reducing a fragment from this 
part of the meteorite to powder in an iron mortar. 
From an analysis of from 60 to 70 grains of filings of the iron obtained in 
the first process of dissection, Dr. Murray Thomson obtained the following 
proportions :— 
Lg ae ae 93°51 per cent. 
Niekel’........ 4-86 ,, 
licaiebens vist. a. +" Ot | 4033 
Carbon. %. 7: 5% 0-59 _ 
99°37, 
Fragments were also examined separately, for carbon and for silica, with 
the following results :— 
Carbon... 07. 0-56 per cent. 
Silica. cuca ete 0:90 ies.) 
agreeing closely with the preceding analysis. 
Portions of this meteoric iron, with a plaster cast of the entire mass, are 
preserved in the Natural History Museum of Edinburgh. The principal part 
is deposited in the Collection of the British Museum. 
Fourth Report of the Committee on Steamship Performance. 
ConTENTs, 
- Report. 
Two sheets of Indicator-diagrams of H.M.S. ‘ Victor Emmanuel.’ 
Appendix.—City of Dublin and Holyhead Company’s Returns :—Abstract of Paper by 
Mr. W. Watson, Managing Director of the City of Dublin Steam Packet Company, 
on London and Dublin Communication (with Table A). 
Table 1.—Engineer’s Log of City of Dublin Steam Packet Company’s Steamship 
‘Munster,’ June and July 1861. 
Table 2.—Abstract of Log of Pacific Royal Mail Company’s Steamship ‘ Quito,’ January 
27th, 1864, to February 5th, 1864. 
Table 3—Table showing performances of the Royal West India Mail Company’s 
Steamers, from Southampton to St. Thomas, from June 2nd, 1862, to June 2nd, 1863. 
ad 4.—Ditto, from St. Thomas to Southampton, from July 30th, 1862, to July 30th, 
3. 
Table 5.—Summations of the Indicator-diagrams taken on the voyages included in 
Table 3, Southampton to St. Thomas. 
Tables 6, 7, 8, and 9.—Four Logs of voyages of the ‘ Great Eastern,’ for 1863. 
Table 10.—Abstract of Engineer’s Log of the Steamship ‘ Great Eastern,’ 18 voyages, 
1860 to 1863. 
Table 11.—Returns of H.M.S. ‘ Victor Emmanuel.’ 
Table 12.—Return of the results of performance of 45 vessels in the service of the 
Messageries Impériales, for the year 1861. 
Table 13.—Return of the results of performances of 49 vessels in the service of the 
Messageries Impériales, for the year 1862. 
Table 14.—Particulars of 12 Steamships indicated by letters of reference. 
“The object of the Committee is to make public such recorded facts through the medium 
of the Association, and being accessible to the public in that manner, to bring the greatest 
amount of science to the solution of the difficulties now existing, to the scientific improve- 
ment of the forms of vessels and the qualities of marine engines. They will especially 
endeavour to guard against information so furnished to them being used in any other way, 
and they trust they may look for the cooperation of Members of Yacht Clubs having steam 
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