Recent Wiltshire Books, Articles, &c. 119 



the smallest rivulet is allowed to flow into the pond. The gang of dew 

 pond makers commence operations by hollowing out the earth for a space 

 far in excess of the apparent requirementsof the proposed pond. They then 

 thickly cover the whole of the hollow with a coating of dry straw. The 

 straw in its turn is covered by a layer of well-chosen finely-puddled clay, 

 and the upper surface of the clay is then closely strewn with stones. 

 Care has to be taken that the margin of the straw is effectively protected 

 by clay. The pond will gradually become filled with water, the more 

 rapidly the larger it is, even though no rain may fall. If such a structure 

 is situated on the summit of a down, during the warmth of a summer 

 day the earth will have stored a considerable amount of heat, while the 

 pond, protected from this heat by the non-conductivity of the straw, is 

 at the same time chilled by the process of evaporation from the puddled 

 clay. The consequence is that during the night the moisture of the 

 comparatively warm air is condensed on the surface of the cold clay. 

 As the condensation during the night is in excess of the evaporation 

 during the day the pond becomes, night by night, gradually filled. 

 Theoretically, we may observe that during the day, the air being com- 

 paratively charged with moisture, evaporation is necessarily less than 

 the precipitation during the night. The dew pond will cease to attract 

 the dew if the layer of straw should get wet, as it then becomes of the 

 same temperature as the surrounding earth, and ceases to act as a non- 

 conductor of heat. This practically always occurs if a spring is allowed 

 to flow into the pond and the layer of clay is pierced." 



The Wiltshire views are : — "View showing Cattle Tracks near Ogbury 

 Camp with Quarry in the foregi-ound," p. 53. "View showing the Dew 

 Pond constructed on the line of the Cattle Tracks near Ogbury Camp," 

 p. 57. '■ View of Cattle Tracks near Eoad leading from Amesbury to 

 Stonehenge converging on Dew Pond," p. 61. "View of Cattle Tracks 

 near to Figsbury Ring," p. 65. " Distant View of Cattle Tracks near 

 Figsbury Ring," p. 69. 



Old Marlborough, a Collection of Pamphlets and 

 Papers of the Seventeenth & Eighteenth Cen* 



turies. Edited from the rare originals by Chr. Wordsworth, M.A., 

 Rector of St. Peter and St. Paul's, in Marlborough. Printed and published 

 by Herbert G. Perkins, at the ^'Times'' Printing Works, Marlborough, 

 1904. Price 1*. nett. 



This pamphlet, 8J X 5|, pp. iv., 33, contains reprints of the following 

 tracts : — 



"A Letter from Mr. Oliver St. John to the Mayor of Marlborough, 



declining to contribute to a Benevolence for K. James I." 

 Notes on Oliver St. John's case. 1614 — 15. 



" A Brief Representation of the Sad and Lamentable Condition of that 

 once flourishing Town of Marlborough in Wiltshire, as it has been 

 represented by severall Letters from creditable Persones of that 

 place to their Friends in London, viz., T. Bayley to Mr. Lawrence, 



