428 Miscellaneous. 



but they arc now completely transformed into carbonate of lime, 

 lthombohcdra of calcite appear to have completed their growth as 

 readily within the spicule as outside it, and the final result of the 

 corrosion is to entirely replace the opal of the spicule by a congeries 

 of minute crystals of calcite. As the crystals may have begun their 

 growth outside the spicule, the latter rarely preserves its charac- 

 teristic regular outlines. The crystals being frequently bounded by 

 impurities of the limestone, the spicules are often as clearly defined 

 as corresponding structures in the Chalk. 



MISCELLANEOUS. 



A Note on the Date of the Parts of' Humboldt and Bonpland's 

 Voyagi : Observation's d< Zoologie.' 



'fins book was issued in livraisons as follows : — 



Vol. L. livr. I, pp. 1-46 (& 47, 48), 180b, forming pp. 1-25 of 2nd issue. 



2, -104, 1^07, „ 2(5-64 



3, -190, 1807, „ 65-126 



4, -293, 1809, ,. 1 27-200 & 253-259 of 



2nd issue. 

 5&6, -412. 1809, ,. 261-297 & 201-252 & 



298-309 of 2nd 

 issue. 



A break then occurred until 1812, when livraison 7 was issued, 

 with the following " Avis " on a loose slip of paper : — " Avec cette 

 Livraison, qui terminera le premier volume des Observations de 

 Zoologie et d'Anatomie coinparee, on fournit aux Abonnes un 

 iiouvcau texte pour la totalite de ce volume. On a cru devoir faire 

 ce sacrifice, a fin que cet ouvrage ressemblat, pour le caraetere et le 

 papier, a toutes les autres parties du Voyage de M. de Humboldt. 

 Les Acquereurs pourront faire relier ce volume ; ils rendront tout 

 le texte des livraisons precedentes, donts il ne conserveront que les 

 planches." Fortunately for nomenclature the British Museum 

 (Natural History) secured some years ago a parcel of odd parts, 

 which prove to be a complete set of the first issue ; these are 

 properly cared for, and are of considerable interest. 



The completion of the work dates as follows : — 



Livr. 7, pp. 305-368 (with reprint of pp. 1-412 of 1st issue, forming 

 'p.p. 1 309 of 2nd issue), 1812 (T.P. dated 1811). 

 Vol. II., livr. 8, 1-64, 1813. 



9, -96, 1813. 



10, -144,1817. 



11, 1 O0 , 1821. 



12, J "— *'1821. 



13, -256. 1827. 



14, -352, 1832 (T.P. dated L833). 



C. Davids Siii;ri;orx 

 ('Index aninialium '). 



