112 THE UNFINISHED BOOK. [1858. 



parallel case in the legs of the donkey, and I have collected 

 some most curious cases of stripes appearing in various 

 crossed equine animals. I have also a large mass of parallel 

 facts in the breeds of pigeons about the wing bars. I suspect 

 it will throw light on the colour of the primeval horse. So 

 do help me if occasion turns up. . . . My health has been 

 lately very bad from overwork, and on Tuesday I go for a 

 fortnight's hydropathy. My work is everlasting. Farewell. 

 My dear Fox, I trust you are well. Farewell, 



C. DARWIN. 



C. Darwin to ?. D. Hooker. 



Moor Park, Farnham [April 26th, 1858]. 



... I have just had the innermost cockles of my heart 

 rejoiced by a letter from Lyell. I said to him (or he to me) 

 that I believed from the character of the flora of the Azores, 

 that icebergs must have been stranded there ; and that I ex- 

 pected erratic boulders would be detected embedded between 

 the upheaved lava-beds ; and I got Lyell to write to Hartung 

 to ask, and now H. says my question explains what had 

 astounded him, viz. large boulders (and some polished) of 

 mica-schist, quartz, sandstone, &c., some embedded, and some 

 40 and 50 feet above the level of the sea, so that he had 

 inferred that they had not been brought as ballast. Is this 

 not beautiful ? 



The water-cure has done me some good, but I [am] nothing 

 to boast of to-day, so good-bye. 



My dear friend, yours, 



C. D. 



C. Darwin to C. Lyell. 



Moor Park, Farnham, April 26th [1858]. 



MY DEAR LYELL, I have come here for a fortnight's 



hydropathy, as my stomach had got, from steady work, into a 



