JST. 50.] GEOLOGICAL SURVEY. 173 



It is the same bed no doubt. What a pleasant excursion you are 

 taking. You and Mrs Evans must enjoy it much. When at 

 Torquay, visit Hope's Nose and see the raised beach (if you have 

 time). First, however, see Brixham and adjacent caves. Mr 

 Pengelly, to whom make my kind regards, is, I understand, at 

 Torquay, and will give you any information. As you pass up 

 the valley between Axminster and Chard, look at the gravels. 

 See also the gravels on cliff between Dawlish and Star Cross. I 

 hope to [be] at Cambridge from the Saturday to the Monday 

 evening. Ever truly yours, J. PRESTWICH. 



September and October were full of short geological 

 expeditions made from town, first, in examining well- 

 sections at Reigate and other localities, later on at 

 Erith and Ilford (both of which places had been visited 

 a score of times) in quest of elephants' teeth and other 

 fossil remains. 



The following letter shows the cordial relations exist- 

 ing between Prestwich and the officers of the Geologi- 

 cal Survey, and their appreciation of the accuracy of 

 his work : 



J. Prestwich to H. Falconer. 10 KENT TERRACE. 



MY DEAR FALCONER, You asked me the other evening to let 

 you know what I had contributed to the new geological map. 1 

 The case stands thus : Thirty years ago I commenced exploring 

 the neighbourhood of London, and, seeing there was no map, I 

 laid down the boundaries of all the beds at the same time that I 

 worked out their superposition. Wishing to make the work 

 complete, and with a view to publication, I worked hard at it for 

 some 15 to 20 years. Just, however, as completed, the Survey 

 came up with me, and Sir H. De la Beche asked me for the use of 

 my maps, which I gave him ; and which I have since continued 



1 This probably referred to the Greenough Geological Map published by 

 the Geological Society, new editions of which were largely based not only 

 on the work of the Geological Survey, but on that of Prestwich, to whom 

 the Geological Survey was greatly indebted. 



