BUNSEN MEMORIAL LECTURE. 639 



and advice.^ Then, in addition, there were the l,eginners. to the num- 

 ber ot 60 or TO, all of whom were looked after by the professor and 

 with some of whom he would spend hours showing them how to detect 

 traces of metals by aid of the -flame reactions," or h„w to estimate 

 the percentage of dioxide in pyrolusite by his iodometric method So 

 from Bunsen all who had eyes to see and ears to hear might learn the 

 important lesson that to found or to carry on successfully a school 

 of chemistry the professor must work with and alongside of the pupil 

 and that for him to delegate that duty to an assistant, however able, is 

 a grave error. 



How, it may be asked, could a man who thus devoted himself to 

 supervising the work of others in the laboratory— and who, besides, 

 had a lecture to deliver every day. and much university business to 

 transact— how could he possibly find time to carry out experimental 

 work of his own ? For it is to be noted that Bunsen never kept an 

 assistant to work at his researches, and unless cooperating with some- 

 one else, did all the new experimental work with his own hands. 



It is true that in certain instances he incorporated the results of 

 analyses, made by a student whom he could trust, into his own 

 memoirs; notably this was the case with the silicate analyses which 

 he used in his chemico-geological papers, and with nianv of the 

 examples given in illustration of some of his new analytical methods. 

 Then, spending the whole day in the laboratory, he was often able to 

 find a spare hour to devote to his own work of devisinsr and testini' 

 some new form of apparatus, of separating some of the i-are earth 

 metals, or of determining the crystalline form of a series of salts. 



Again the editing of the research, and the calculations, often com- 

 plicated, which that involved, were carried on in the early morning 

 hours. When, for four summers after the year 1857 I spent my 

 vacations working at Heidelberg, I lived in his house, and although 

 I rose betimes, I alwa3's found him at his desk, having begun woi-k 

 often before dawn. 



Then, although he frequently traveled during the vacations at 

 Easter and in the autumn, often, I am glad to remember, with myself 

 as companion, he generalh^ returned after a short absence to contiinu' 

 an unfinished, or to commence some new, research, and duiiiig these 

 quiet days much work was done by both of us. 



^ During the twenty years following 185fi the following were among th<i«' who 

 worked with Bunsen: Graebe, Ladenburg, ButHchli, Wichelhaus, I^u-jK-yres. Hi.luinl 

 Meyer, Victor Meyer, Crum Brown, Thori)e, H. Kosenl>iisch, H<irxtMiarni, Kiniiu-r- 

 ling, A. Salkowski, Bunte, Guido Goldschuiiedt, (iiltson, Smitlu'll.s Mit-hat'l, Zorn, 

 Bernthsen, Ki'migs, Treadwell, Ilerzig, Fabinyi, Wanklyn, IMiipHon Beale, fartiiifll. 

 Long, Schischkoff, Andrejeff, Beils^tein, Filipiizzi. Schnei.ler, l>..llfus-,\ii»H't, Kiindig, 

 Gopp'elt^roeder, IMaylxjom, Nessler, Winckler, Rose, Lucius, Friedliinder, L. Mnnd. 

 Sprengel, Mes.«el, and, lastly, Curtius, who at present occii|iies the chair of chemistry 

 at Heidelberg. 



