100 CITY LIFE. [1856-57. 



Tertiaries, showing their vertical distribution in the 

 latter series. The table given in this paper of the 

 Barton fossils, with their equivalents in France and 

 Belgium, is also most elaborate. 



MILDENHALL, SUFFOLK, Janry. 30, 1857. 



MY DEAR PRESTWICH, I only received your proof to-day, sent 

 me here into the country. 



It makes me very desirous to see more please to send me 

 other proofs : as I return to town to-morrow, I shall be able to let 

 you have them again immediately. I have not sent to the press 

 my pp. in which I adopt the term Lower Miocene as the name 

 for what I have called in 5th edn. Upper Eocene, but I must 

 send them in a few days. 



Your paper interests me much the tables at p. 10 [pp. 93, 118] 

 in particular. They are well imagined and startling, and remind 

 one of Barrande's Colonies, on which I am writing two adjoining, 

 contemporaneous, distinct natural-history provinces. You have 

 brought out the difference well. 



Darwin will make much of it. Some barrier there must have 

 been, but I daresay the so-called species are permanent varieties, 

 as you suggest, in many cases like Lowe's varieties of many 

 land shells in the different Madeira islands, which he makes into 

 species. 



If you give a general table pray send it to me, that I may see 

 your divisions. Ever, &c., CHAS. LYELL. 



Perhaps Prestwich's mode of life at this time con- 

 duced to the marvellous amount of published work. 

 Before he had assumed control of City affairs Mark 

 Lane had been his home, where an old housekeeper 

 ministered to his wants and provided in conformity 

 with instructions his very simple fare. Soon after 

 dinner, or about eight or nine o'clock, the note-books 

 were by his side, with maps and sections ; and with a 

 sheaf of foolscap before him, it became his regular 

 practice to write far on into the night. It was thus 



