390 
Catalogue of Plants and Invertebrata. I860. 4to. — From the 
same. 
Catalogue of Fossil Plants. 1855. 4to. — From the same. 
Catalogue of Yertebrata in Spirit. 1859. 4to. — From the same. 
Observations on Geology. By John Hunter, F.B.S. 1859. 4to. 
■ — From the same . 
Catalogue of Fossil Reptilia and Pisces. 1854. 4to.- — From the 
same. 
Catalogue of the Histological Series. Vol. II. 1855. 4to. — 
From the same. 
Journal of Geological Society of Dublin. Yol. YIII., Part 3.-— 
From the Society. 
Journal of Statistical Society of London. Yol. XXIII., Part 4. 
— From the Society. 
Monthly Notices of Astronomical Society. Yol. XXI., No. 1. — 
From the Society. 
A Treatise on Physiology and Anatomy in the Chinese Language. 
By Benjamin Hobson, M.B. — From the Author. 
Treatise on Midwifery and Diseases of Infants in Chinese. By B. 
Hobson, M.B. — From the same. 
Treatise on the Science and Art of Western Surgery in the Chinese 
Language. By B. Hobson, M.B. — From the same • 
Treatises on Medicine and Natural Philosophy in the Chinese 
Language. By B. Hobson, M.B. — From the same. 
A Medical Vocabulary in English and Chinese. By B. Hobson, 
M.B. 1858. — From the same. 
Transactions of Botanical Society, Edinburgh, 1860. — From the 
Society. 
Monday , 7th January 1861. 
Professor CHRISTISON, Y.P., in the Chair. 
The following Communications were read : — - 
1. Note on Hydrated Sulphuric Acid. By Dr Lyon 
Playfair, C.B. 
It is well known that hydrated sulphuric acid loses sulphuric 
anhydrid on heating, and that its specific gravity decreases in con- 
