1856 IN SWITZERLAND 1 55 



ing from the results of a spell of overwork was to take a 

 short walking tour with a friend. In April 1857 he is ofif 

 for a week to Cromer; in i860 he goes with Busk and 

 Hooker for Christmas week to Snowdon ; another time he 

 is manoeuvred ofT by his wife and friends to Switzerland 

 with Tyndall. 



In Switzerland he spent his summer holidays both in 

 1856 and 1857, in the latter year examining the glaciers 

 with Tyndall scientifically, as well as seeking pleasure by 

 the ascent of Mont Blanc. As fruits of this excursion were 

 published late in the same year, his " Letter to Mr. Tyndall 

 on the Structure of Glacier Ice " (Phil. Mag. xiv. 1857), and 

 the paper in the Philosophical Transactions of the Royal 

 Society, which appeared — much against his will — in the jomt 

 names of himself and Tyndall. Of these he wrote in 1893 

 in answer to an inquiry on the subject : — 



By the Observations on Glaciers I imagine you refer to a 

 short paper published in Phil. Mag. that embodied results of a 

 little bit of work of my own. The Glacier paper in the Phil. 

 Trans, is essentially and in all respects Professor Tyndall's. 

 He took up glacier work in consequence of a conversation at 

 my table, and we went out to Switzerland together, and of 

 course talked over the matter a good deal. However, except for 

 my friend's insistence, I should not have allowed my name to 

 appear as joint author, and I doubt whether I ought to have 

 yielded. But he is a masterful man and over-generous. 



And in a letter to Hooker he writes :— 



By the way, you really must not associate me with Tyndall 

 and talk about our theory. My sole merit in the matter (and for 

 that I do take some credit) is to have set him at work at it, for 

 the only suggestion I made, viz. that the veined structure was 

 analogous to his artificial cleavage phenomena, has turned out 

 to be quite wrong. 



Tyndall fairly made me put my name to that paper, and 

 would have had it first if I would have let him, but if people 

 go on ascribing to me any share in his admirable work I shall 

 have to make a public protest. All I am content to share is the 

 row, if there is to be one. 



The following letters to Hooker and Tyndall touch upon 

 his Swiss trips of 1856 and 1857 : — 



