iv "BUNSENIANA" 



75 



graphed. Many years afterwards, my friend Dr. 

 Mond was very anxious to have a good oil-painting of 

 Bunsen, and he therefore commissioned Mr. Hans 

 Schadow to go to Heidelberg and see whether he 

 could paint his portrait without a formal sitting and 

 without Bunsen's knowledge ; and so the painter went, 

 and, being well known to several of Bunsen's friends, 

 he arranged with them that he should dine at the 

 Grand Hotel at the same table where Bunsen usually 

 had his midday meal. Whilst Bunsen was engaged in 

 lively conversation he narrowly observed him and 

 secretly made sketches on his knee of his various 

 expressions, and from these he painted a likeness of 

 the old man. 



From 1857, on my appointment in Manchester, to 

 1863, the year of my marriage, I invariably spent 

 the long vacation working with Bunsen at Heidel- 

 berg ; the chief result of such work was the publication 

 of the photo- chemical researches already referred to. 

 I followed up these investigations in subsequent years, 

 describing an automatic arrangement for registering 

 the chemical action of light by the blackening of 

 standard silver paper. A form of the apparatus 

 designed for meteorological purposes was made for 

 me by Horace Darwin, of Cambridge. A description 

 of the method was published in the Philosophical 

 Transactions (Bakerian Lecture, 1865); it worked ex- 

 tremely well, but has not yet been generally adopted in 

 observatories, as I had hoped it would be. 



In the year 1886 the eighth Jubilee of the foundation 

 of Heidelberg University 400 years before was cele- 

 brated, and I was invited to be present and was one of 

 the few to whom an honorary degree (in my case M.D.) 

 was given. The festivities were of an unusually interest- 

 ing character. Processions illustrating striking events 



