in "HEIDELBERG DU FEINE " 61 



pressure to which the luting liquid saturated with H and 

 Cl is subjected constantly changes. I therefore conclude 

 that Draper's instruments will not indicate proportionality, 

 &c., especially as the volume of the isolated gas is so small 

 compared with that of the luting liquid. At any rate I see 

 no grounds for interrupting our experiments ; still less do I 

 consider that it is a misfortune that the results which we 

 have obtained should have been to some extent previously 

 described by him. It appears to me that the value of an 

 investigation is not to be measured by whether something 

 is described in it for the first time, but rather by what means 

 and methods a fact is proved beyond doubt or cavil, and in 

 this respect I think that Draper has left plenty for us to do. 

 Do not, therefore, let your discovery of Draper's work 

 disconcert you. I am now busy getting my Eudiometry* 

 ready for press, and I hope by Easter to have made an end 

 of it. My best greetings to Williamson, in hearty friendship. 



Yours, 



R. W. BUNSEN. 



I naturally enjoyed greatly the close personal relation- 

 ship with Bunsen which this work brought with it. A 

 special room in the laboratory was assigned to me for 

 carrying it on, and as the apparatus required super- 

 vision in the night, a bedroom was set apart for me in 

 his house. It is almost needless for me to remark 

 that without Bunsen's advice, assistance, and co- 

 operation I should never have succeeded in obtaining 

 the results we did ; and although I carried out the 

 experimental part of the work, the elaboration of the 

 results was mainly due to him. Only those who have 

 had the pleasure and the benefit of working directly 

 with Bunsen can fully appreciate the value of his 

 teaching and of his example, and this pleasure and 

 benefit I had in abundance. I was usually able to 

 get away from Manchester at the beginning of July 

 and worked steadily in Heidelberg until the middle 



1 Translated into English by myself and published by Taylor and 

 Walton. 



