Ixviii PROCEEDINGS, 



215th Oebinary Meeting, 10th Apkil, 1900, at "Watford. 

 Alan F. Grossman, F.L.S., F.Z.S., Vice-President, in the Chair. 

 Miss A. Hibbert-Ware was elected a Member of the Society. 

 The following papers were read : — 



1. "Report on Phenological Phenomena observed in Hertford- 

 shire during the Year 1 899." By Edward Mawley, Sec. R.Met. Soc, 

 r.H.H.S. {Transactions, Yol. X, pp. 173-179.) 



2. "The Habitats of the Mycetozoa." By James Saunders, 

 A.L.S., and E. Saunders. {Transactions, Yol. X, pp. 169-172.) 



3. " Notes on Lepidoptera observed in Western Hertfordshire 

 in 1897, 1898, and 1899." By Arthur Cottam, F.R.A.S. {Trayis- 

 actions, Yol. X, pp. 185-190). 



4. "A Curious Instance of the Labour-saving Instinct in the 

 Leaf-cutting Bees." By Aubrey C. Stoyel. {Transactions, Yol. X, 

 pp. 191-192.) 



5. "Xotes on Birds observed in Hertfordshire during the Year 

 1899." By Alan F. Crossman, F.L.S., F.Z.S., M.B.O.IJ. {Trans- 

 actions, Yol. X, pp. 180-184.) 



6. " Notes on Curious Nesting-places." Communicated by John 

 Hopkinson, F.L.S. {Transactions, Yol. X, p. 192.) 



Field Meeting, 5th May, 1900. 

 ARLESET AND HITCHIN. 



This meeting was held in conjunction with the Geologists' 

 Association, and was under the direction of Mr. William Hill, F.(i.S. 

 The members of that Association came by train to Three Counties 

 Station with some members of the Hertfordshire Society, others 

 cycling from Watford and St. Albans. 



A large pit near the station, where " coprolites " were formerly 

 dug, but now worked for brick-making, was first visited. Little 

 is now to be seen but the Gault clay from which bricks are made, 

 but for a short distance on the eastern side of the pit there is 

 a section showing the base of the Chalk Marl, the Cambridge 

 Greensand which is here very thin, and the Gault. Bemarks upon 

 the section were made by Mr. AV. Whitaker, F.B.S., who stated that 

 the Greensand had evidently been deposited upon an eroded surface 

 of the Gault, for although its base was well defined, the surface 

 of the Gault on which it rested was uneven. Most of the fossils 

 which it contained were derived from the Gault, but some were 

 contemporaneous with its formation, and their afilinities being more 

 with the fauna of the Chalk than with that of the Gault, the bed 

 was regarded as the base of the Chalk. The Gault is here exposed 

 to a depth of about fifty feet, and is unfossiliferous. 



The party then took a field-path to the Arlesey Cement Works, 

 a rather awkward one for the cyclists owing to the stiles on the 

 way. The section seen here is a continuation upwards of that 



