4«8 Account of Booh- 



committee more attentively confidcred the model of his bridge. It wa& compieated at the 

 clofe of the year 1758, and flood without receiving any injury till 1789, when a fevr 

 decayed beams were replaced by new wood ; fince which trifling repair the bridge is as 

 found as ever. The fame artift ofiered to build a fimilar one-arched bridge acrofs the 

 river Derry, in Ireland, which is 600 feet wide ; but this plan was rcjefted." 



u1 new Syjlem of Mineralogy, in the form of a Catalogue, after the manner of EaroH 

 Born's Syjlematic Catalogue of the ColleBion of FoJJils of Madenwf'dle Eleonore de 

 Raab. By William Babingtoii, M. D. AJJiflant Phyfician and LrElurer in Chemijlry, at 

 Guy's Hofpital. Quarto, 279 pages, and Index, price t^s. in boards. Sold by Phillipj 

 and Robinfons. 



My Suffrage will be unnecefTary either to add to the repntation of Dr. Babington, 

 or to fupport the truth that the public muft be ever moft elfcntially benefited ; when 

 men of aftual refearch and obfervation compofe elementary treatifes, which are more 

 commonly fabricated by mere compilation. The work refers to the Colle61ion of Sir 

 John St. Aubyn, Bart, to whom it is dedicated, and the author has availed himfelf of 

 thebeft authorities for thofe experimental refults, of which the life of no fingle individual 

 h fufficient for the inveftigation or even the repetition. His obligations to BaroH 

 Born are expreifed in the title page. Rome de Lille has beeii his guide on the fubjeft 

 of cryftallizaiion ; moft of his defcriptions correfpond with thofe of Widenmann and 

 Emmerling, and he has chiefly recurred to Kirwan for objefts of chemical properties 

 and analyfis. His clafTes, orders, genera, and fpecici, arc founded «n the cheinis^l 

 and his varieties on the external cha^-aflert of miner^s. 



