Iviii PBOCEEDINGS OF THE 



In illustration of these papers microscopic fungi were exhibited 

 by Mr. Chater and other members under their microscopes, and 

 Hertfordshire plants by Mr. Pryor. 



Various living objects, collected at the Field Meeting on Stan- 

 more Common, were also exhibited by the members under their 

 microscopes, and Mr. Arthur Cottam described the sti'ucture of 

 Conochilus volvox, of which he and the Honorary Secretary ex- 

 hibited specimens under different powers and different methods of 

 illumination in order to illustrate it in various aspects. 



Field Meeting, 26th May, 1877. 

 Pinner. 



Leaving Pinner Station at about three p.m. on the amval of trains 

 from Watford and Euston, the members proceeded first to the 

 lime-kiln and sand-pit between Wood Hall and Pinner Green, known 

 as "The Dingles," where the northern margin of the "Pinner 

 Inlier " of the Woolwich and Eeading Beds is exposed, and a 

 shaft is sunk through them to the Chalk. 



Here the director of the meeting, Mr. J. Logan Lobley, F.G.S., 

 gave an account of the geology of the neighbourhood, more es- 

 pecially explanatory of this inlier. Outliers, he said, are portions 

 of a formation detached from the main mass and surrounded by 

 lower beds, of which we have an example in the ' ' Harrow 

 Outlier " of the Bagshot Sands. Inliers, on the other hand, are 

 exposures of underlying beds laid bare by the removal of higher 

 ones by which they are surrounded. This Pinner inlier is in the 

 London Clay area, the boundaiy of which is about three miles to 

 the north, and the Woolwich and Reading Series here seen — 

 surrounded on all sides by the London Clay — has been brought up 

 by an upheaval, and the same upheaval to which we are indebted 

 for the hill on which stands Windsor Castle, which is an inlier of 

 the Chalk surrounded by Tertiary beds, and is in a line with the 

 inliers at Ruislip Ilcservoir, Northaw, and here. Tlie London 

 Clay is a few feet to the north of us, so that we are just on the 

 northern margin of the inlier, which includes the village of Pinner 

 and runs west to Ercot. The outlier of the Bagshot Sands at 

 Harrow, he concluded, is the most northern patch of these sands in 

 existence, not only in England, but in the world. 



After examining the section of the Heading Beds, and noticing 

 the shaft which is sunk forty feet through them to the Chalk, here 

 got at to burn for lime, the members left the pit, and a little to the 

 north, a dyke, known as Oryme's Dyke, was pointed out by Mr. 

 William A. Tooke, who then conducted the party to his residence, 

 Pinner Hill, where tea was kindly provided, after which most of 

 the party ascended a clock tower wliicli he lias recently built. 



From the summit of tlie tower, which is fifty-five feet high, a 

 good view of the surrounding country was obtained, and Mr. 



