GEOLOGY APPLIED TO CIVIL ENGINEERING. Ill 



2nd. with the lobes unequal ; (A) the saddles unequal, 

 [A. Clypeiformis, Jean-uoti, Deshayesi^ Gonpilianus, ^c.) ; 

 (B) the saddles equal, {A. denarius, Gmsianus, Dyphyllus, 

 Mayorianus, Velledce, ^c), 



[To be continued. 1 



GEOLOGY APPLIED TO CIVIL ENGINEERING, 



On the recent slips of earth on the Brighton and Croydon 

 Railivays ; the Geological reasons of their occurrence ; and 

 hints for the prevention of earth slips. By the Editor. 



As long as Geology remains a science of pleasure and intel- 

 lect only, so long we fear, must it be considered as liable to 

 an unfavourable reception from the public generally of the 

 present day ; but fortunately, the various purposes for 

 which it is so aptly designed, and the number and value of 

 the objects which have already been gained by a successful 

 adoption of its principles in the rule of action, have contri- 

 buted not a little to its popularity, and to its general study. 



We have been forcibly struck of late by the various opi- 

 nions which we have heard expressed as to the successive slips 

 of earth which have taken place on the Croydon and Brighton 

 Railways, many of them arguing solely upon mechanical, 

 many more upon Geological hypotheses only^ whilst both 

 only arrived at their surmises by a tolerable infusion of 

 doubtful assertions, founded upon fewer observations than 

 reports. The subject being one of very general interest, not 

 only to the Geological world, but to railway capitalists gene- 

 rally^ we have taken this favourable opportunity of offering 

 an opinion upon the subject, from a careful examination of 

 the facts, as well as of the respective localities of the shps in 

 question^ which we hope will contribute to a more general 



