C 21 ] 
Presents. 
LEA (Isaac) Check List of the Shells of North America. — Unionidse. 8vo. 
Tables of the Rectification of Mr. T. A. Conrad’s “ Synopsis of the 
Eamily of Naiades of North America.” 8vo. Philadelphia 1866. 
LE VERRIER (IT. J., For. Mem. R.S.) Annales de l’Observatoire Imperial de 
Paris. Memoires, Tomes YII., VIII. Observations, Tomes VI.-X., 
XVIII.-XX. 4to. Paris 1863-66. 
LEZZANI (M.) Lettera al Direttore della Corrispondenza Scientifica. 4to. 
Roma 1866. 
LINTON (It.) The Discovered Laws of the sizes and rotations of the Sun and 
Planets. 8vo. London 1858. 
LITTROW (C. von) Annalen der k.-k Stern warte in Wien. Dritter Folge 
Eand XIII. 8vo. Wien 1866. 
— und WEISS (E.) Meteorologische Beobachtungen an der 
k.-k Sternwarte in Wien von 1775 his 1855. Band V. 8vo. Wien 1866. 
LOBTET (L.) Recherches sur les Variations de salure de l’ean de la Mer Morte 
en divers points de sa surface et a differentes profondeurs. 8vo. Paris 1866. 
Recherches sur la fecondation et la germination du Preissia 
commutata. 8vo. Paris 1867. 
Recherches sur la Vitesse du Cours du Sang dans les Arteres 
du Cheval au Moyen d’un nouvel Hemadromographe. 4to. Paris 1867. 
LOWE (E. J., F.R.S.) A Natural History of New and Rare Ferns. Parts 6-18. 
8vo. London 1862. 
. Beautiful Leaved Plants. Parts 18-20. 8vo. London 
1861. 
Our Native Ferns and their Varieties. Parts 1, 19, 
22-28. 8vo. London 1867. 
LUBBOCK (Sir John, F.R.S.) On the Development of Chloeon (Ephemera) 
dimidiatum. Part 2. 4to. London 1866. 
and LUBBOCK (F.) On the true Assignation of 
the Bronze Weapons found in Northern and Western Europe. 8vo. London 
1866. 
LUTHER (E.) Astronomische Beobachtungen auf der Ivoniglichen Universitats- 
Sternwarte zu Konigsberg. 35 Abtheilung. fol. Konigsberg 1865. 
MAC-GILLAVRY (Th. H.) Onderzoekingen over de Hoegrootheid der Aecom- 
modatie. 8vo. Utrecht 1858. 
MACLEAR (Sir T., F.R.S.) Verification and Extension of La Caille’s Arc of 
Meridian at the Cape of Good Hope. 2 vols. 4to. London 1866. 
MACLOUGHLEN (D.) No Medical Practitioner in England or France could or 
can point out one symptom Pathognomic of a Syphilitic Virus. 8vo. London 
1867. 
MAILLY (E.) Essai sur les Institutions Scientifiques de la Grande Bretagne et 
de l’lrlande. VI. 8vo. Bruxelles 1866. 
MARIGNAC (C.) Recherches sur les Combinaisons du Tantale. 8vo. Geneve 
1866. 
Recherches sur les Combinaisons du Niobium. 1“' & 2 e 
Memoires. 8vo. Geneve 1865-66. 
Sur quelques fluosels de l’Antimoine et de 1’ Arsenic. 8vo. 
Donors. 
The Author. 
The Observatory. 
The Author. 
The Author. 
The Observatory. 
The Author. 
The Author. 
The Author. 
The Authors. 
The Observatory. 
The Author. 
The Admiralty. 
The Author. 
The Author. 
The Author. 
Geneve 1867. 
