42 Proceedings. 



In conclusion, Mr. Blaber urged his liearers to a diligent 

 study of the life-history of the insects they met with. 



In illustration, Mr. Blaber exhibited specimens of pupsB, 

 perfect insects, drawings of insects' eggs, &c. 



Ea'ening Meeting. — Apkil 17th, 1891. 



Mr. E. S. Salmon exhibited specimens of Helleborus viridis 

 found by him at Four Elms, near Edenbridge. 



Mr. Sydney Webb exhibited a most remarkable collection 

 of specimens of the Currant Moth and Small Tortoiseshell, 

 showing a great deal of variation. 



' The Keport of Marlborough College Natural History 

 Society ' for 1890 was presented by the Society. 



Mr. Gilford read a paper entitled ' Are there Coalfields 

 IN Surrey ? ' — 



It may assist us, if, in entering upon this subject, we con- 

 sider in the first instance the various formations from those 

 of this district to those down to the Coal-measures with their 

 thicknesses, if all were found in their position and typical 

 thickness. We have first the Chalk formation, the Upper 

 Greensand, the Gault, the Lower Greensand, the Weald 

 Clays, and the Hastings Sands ; all these formations forming 

 the Cretaceous system of an aggregate thickness of 2600 feet, 

 and consisting of all the formations spread out before us 

 from the standpoint of the Chalk of the North Downs, to the 

 Chalk of the South Downs in the dim distance. 



The next series of formations commencing with the Pur- 

 becks, the Portland Kocks, the Kimmeridge Clays, the Oxford 

 Clays, and the Oolites, the last of which comprise the Iron- 

 stone district of Northamptonshire. The whole of these 

 formations belong to the Oolitic system, 2200 feet thick. 



The next are the Liassic formations, consisting of the 

 upper, the middle, or Marlstoue, and the lower Lias, 

 altogether 1200 feet thick. These formations are found 

 covering the greater part of Leicestershire. 



