Iviii PEOCEEBINGS OF THE 



which become wings, of which two were formed on each side. The hinder one 

 of each carried on the outer edge hooklets, which caught the back edge of the 

 front wing when engaged in flight. The nymph, which might be carried a con- 

 siderable distance by a slight breeze, laid four or five eggs from which were 

 hatched perfect males and iemales. Both sexes were apterous and had no diges- 

 tive organs. The female laid but one egg, which was almost as large as its own 

 body, so that it resembled a walking egg. Unlike some other aphides, it placed 

 the egg with due regard for the food of the larvae, choosing a sheltered position 

 on the branches or trunk of the vine, while sometimes, dying before the fulfilment 

 of its maternal duties, its skin afforded additional protection to its progeny. This 

 was the egg which passed through the winter with uninjured vitality and hatched 

 in the spring. 



Mr. Campbell illustrated his paper by microscopic preparations 

 of Phylloxera vastatrix and other aphides in various stages of their 

 life. 



Ova and larvae of the common frog {Rnna tempnrarid) in various 

 stages of development were exhibited by Mr. George Turner and 

 Mr. Croft, and objects illustrating pond-life, by Mr. F. W. Phillips 

 and Mr. Henry Warner, under their microscopes. Mr. Croft also 

 showed the Fodura-scdle under a i-o-th-inch homogeneous immersion 

 object-glass by Messrs. Powell and Lealand. 



Oedikaet MEETiifG, 19th Apeil, 1881, AT "VVatfoed. 



George Eooper, Esq., F.Z.S., President, in the Chair. 



Mr. Thomas Bates Blow, "Welwyn ; Mr. Alfred Cox, Presdales, 

 Ware ; Mr. Percy Frederick Pordham, Bank House, Royston ; 

 Miss Alice Warner, The Woodlands, Hoddesdon ; and Mr. Henry 

 Warner, Wormley, were elected Members of the Society. 



The following communications were read: — 



1. "Meteorological Observations taken at Wansford House, 

 Watford, during the year 1880." By John Hopkinson, P.L.S., 

 P. M.S., etc., Hon. Sec. {Transactions, Vol. I, p. 251.) 



2. "Report on Phenological Observations in Hertfordshire in 

 1880." By John Hopkinson. [Transactions, Vol. I, p. 257.) 



3. "Notes on Birds observed during the year 1880, and the 

 first three months of 1881." By John E. Littleboy. {Transactions, 

 Vol. I, p. 239.) 



4. "On the presence of Cilia on the Tadpole of the Common 

 Prog." By R. B. Croft, R.N., P.L.S., P.R.M.S. {Transactions, 

 Voh I, p. 264.) 



FiELB Meeting, 7th May, 1881. 



THE BOURNE VALLEY, BOXMOOR. 



At the little hamlet of Bourne End, between Boxmoor and 

 Berkhampstead, there occasionally flows under the high road, 

 through a culvert about a foot in diameter, a small stream known 

 as the Hertfordshire Bourne. It is one of those intermittent rivers 



