The Iguanodon in the sands of the chalk. 355 



Mr. Thomas G. Clemson, (whose skilful analyses have several 

 times appeared in this Journal,) has analyzed a copper ore from 

 Flemmington, N. J. and finds it to consist of copper .540, iron 

 .134, insoluble matter .082, sulphur .244=1000. 



In concluding our citations from this important volume, we take 

 the liberty to remark, that a spirit of courtesy and forbearance tow- 

 ards those who may differ from us, or who perchance may have 

 committed errors to which all are liable, and from which few are ex- 

 empt, forms, in our view, a bright ornament of scientific and literary 

 labor. We regret to see any indications of an opposite spirit, in a 

 city not less distinguished for courtesy, than for science, and w'hose 

 very name rebukes every thing unamiable. The present volume, ex- 

 cellent as it is, contains an article which proves that the most acute 

 may err, and that it is better frankly to retract an error once commit- 

 ted, than to attempt its perpetuation in the face of decisive eviden ce. 



We- confess also, that w^e have great reverence for the ancient 

 maxim, nil de mortuis nisi boniim. 



Art. XXIV. — Notice of the discovery of the remains of the Ig^ 

 uanodon in the Lower Green Sand Formation of the South-east 

 of England. Communicated for this Journal, by Gideon Man- 

 tell, Esq. F. R. S. LL. D., he. &,c. of Brighton, England. 



Maidstone one of the most beautiful and important towns in the 

 county of Kent, is situated on the banks of the river Medway, about 

 thirty five miles S. E. of London. The immediate subsoil of the 

 district is a rich diluvial loam, in which bones and teeth of the horse, 

 deer, and elephant have been discovered. This loam overlies and 

 conceals extensive beds of limestone and sandstone ; but in many 

 places the loam has been removed, and quarries opened for extract- 

 ing the stone which is principally employed in architecture and for 

 road-making; the calcareous varieties being converted into lime. — 

 This arenaceous limestone is well known in England by the provin- 

 cial term of " Kentish Rag.^^ In a quarry of this kind, situated at 

 a short distance to the south-west of the town, some laborers em- 

 ployed in extracting the stone, observed numerous fragments of 

 bones in the ruins of a large mass which they had just blasted to 



