537 
By inspecting the piles of marbles for the two cases, it is easy to 
see without analysis, that the densities are equal. This is best seen 
by removing an edge of the tetrahedral pile. 
I have tried to connect these results with allotropic forms of bodies 
which crystallize in the first system (and an easy modification allows 
us to pass to other systems) — but though diamond and graphite 
seem to agree so far with it — it must be taken at present as a pure 
speculation. 
The following Gentlemen were admitted Fellows of the 
Society : — 
Walter Boyd M‘Kinlay, M.D., F.R.C.S.E. 
Edmund Ronalds, Ph.D. 
John J. Macartney, M.D. 
The following Donations were received : — 
Quarterly Report of the Meteorological Society of Scotland. 8vo. 
- — From the Society . 
Twelfth, Thirteenth, and Fourteenth Annual Reports of the Regents 
of the University of the State of New York, on the Condition 
of the State Cabinet of Natural History. 8vo. — From the 
New York State Library. 
Seventy-Third and Seventy-Fourth Annual Reports of the Univer- 
sity of the State of New York. 8vo. — From the same. 
Forty-Second and Forty-Third Annual Reports of the Trustees of 
the New York State Library. 8vo. — From the same. 
Guide to the Geology of New York, and to the State Geological 
Cabinet. 8vo. — From the same. 
Magnetical and Meteorological Observations made at the Govern- 
ment Observatory, Bombay. 1859. 4to. — From the India 
Office. 
Vis Inertise Victa, or Fallacies affecting Science. By James 
Reddie. 1862. 8vo. — From the Author. 
Contribuciones de Colombia. Por E. Uricoechea. 1860. 8vo. — 
From the Author. 
Memoire sur l’lntegration des Equations Differentielles relatives 
au Mouvement des Cometes. Par Jean Plana. 1861. 8vo. 
— From the Author. 
