September 22, 1923] 



NA TURE 



451 



inevitable characteristic of every form of official service. 

 Two examples are worth recording, for ever}^ friend 

 of Hayden will'recognise them as typical. 



We were moving camp to a new field where there 

 was a probability that the fast-coming hot weather 

 would soon make work difficult. The hot, west winds, 

 laden with fine dust, had significantly started as a 

 warning that life in tents would soon be impossible. 

 Every day was important, when, through the negli- 

 gence of a local subordinate official, transport facilities 

 Ijroke down absolutely within twenty miles of our new 

 field. I was annoyed especially because my mail 

 having been directed from headquarters to the new 

 'amp, the enforced halt could not be utilised even for 

 office work. There seemed to be no escape from a 

 wasted day of useless grumbling. On rising next 

 morning Hayden was missing, but by noon he turned 

 lip loaded with heavy postal packets, and then I found 

 that he had been to fetch my mail, and, as I afterwards 

 discovered, had cycled nearly forty miles over what 

 only an Indian District Board would be content to call 

 a road. Few but Hayden would have thought of it ; 

 none but Hayden would have done it silently, as if 

 it were only the usual thing. 



Four years later Sir Francis Younghusband was 

 starting on his mission to Lhassa. The remarks in 

 the Director's Annual Report for 1902-3 (Rec. Geol. 

 Surv. Ind., vol. xxxii. pp. 153-156) show why at that 

 time we were anxious to know whether on the northern 

 side of the snow-covered, crystalline range of the 

 Eastern Himalaya there had been an extension of the 

 Mesozoic fossiliferous basin which had been surveyed 

 in Spiti and other parts of the north-western Himalaya. 

 I hurried to Darjeeling to intercept Younghusband, 

 who was then on his way to join the expedition that 

 had already started into Sikkim. He realised the value 

 of the problem and readily offered to give facilities for 

 .1 geologist to join the party, but warned me that unless 

 an officer could move at once he might be too late. 

 1 returned immediately to Calcutta and put the 

 question before Hayden, who promptly volunteered 

 to cancel his local engagements, and although he 

 knew the meaning of winter on the inhospitable plateau 

 of Tibet, did not wait to discuss conditions or settle 

 his local affairs, but moved off within twenty-four 

 hours, trusting to pick up transport and equipment on 

 the way. Within a fortnight there came back a parcel 

 of Spiti shale fossils and a letter that opened a new 

 chapter in Himalayan geology. Hayden was away for 

 more than a year, and how he covered so much ground 

 with such excellent results was known only to him 

 and to his kindred spirit, Sir Francis Younghusband. 



Always moving rapidly, but never too hurried to 

 help a colleague ; always doing something, but 

 mentally as well as physically, Hayden piled up a 

 record of solid results which would have been the 

 envy in turn of the sportsman, the explorer, the 

 scientific worker and the most orthodox official. After 

 graduating at Trinity College, Dublin, in engineering 

 IS well as arts, he made a journey round the world 

 l)efore joining the Geological Survey of India in 1895. 

 He was appointed Director of the Department in 1910 

 and held office for eleven years. Meanwhile, as a 

 junior officer his work touched most of the provinces 

 if India, l)ut his Himalayan and trans-frontier strati- 

 j,raphical work naturally attracted most attention, 



NO. 2812, VOL. I 12] 



the chief scientific results being included in his memoirs 

 on Spiti and Bashalir (Mem. Geol. Surv. Ind., vol. 

 xxxvi., part i), on the provinces of Tsang and tj in 

 Central Tibet (vol. xxxvi., part 2), and on Northern 

 Afghanistan (vol. xxxix., part i). Just before leaving 

 for Switzerland he completed and sent to the press in 

 French his account of the journey through northern 

 Tibet during 1922, that is, after he had retired from 

 the Indian Government service. 



In 1915 the Geological Society awarded Hayden 

 the Bigsby medal, and he was elected a fellow of 

 the Royal Society in the same year, whilst Calcutta 

 University conferred on him the honorarv' degree of 

 D.Sc. He served successively as president of the 

 Mining and Geological Institute of India and of the 

 Asiatic Society of Bengal. In 191 1 his official service 

 was recognised by the CLE. ; in 1919 he received the 

 senior order of C.S.I. , and on the day of his embarkation 

 at Bombay in June 1920, preparatory to retirement 

 from the office of Director of the Geological Survey, 

 his knighthood was gazetted. 



The accident which led to Hayden 's death with his 

 two guides must have occurred soon after August 12, 

 on his return from an ascent of the Finsteraarhom,. 

 but his body was not found until August 28. The 

 details of his death will never be known, but if the final 

 and determining incident was not a definite attempt 

 to save his companions, it was not Hayden's fault. 

 He was buried by friends on September i at Lauter- 

 brunnen, and the selection of the spot would almost 

 certainly be in accordance with his own wish. Perhaps 

 of all the many incidents that one can recall as illustra- 

 tions of his generous nature, my last glimpse of him 

 was the most characteristic : it was just a few days 

 before he started on his tour in Switzerland ; he was 

 busy with his preparations, but looked in to say fare- 

 well on his way to see the sick relative of a friend who 

 was away from home. One frequently came across 

 instances of his generosity to the poor and sick, but 

 not even the most intimate of his friends knew them 

 all ; as in his work, each act of kindness followed too 

 closely on its predecessor to allow of time for talking 

 about it. T. H. Holland. 



The issue of the Physikalische Zeitschrijt for July 15 

 contains an obituary notice of Prof. O. Lehmann by 

 Drs. A. Schleiermacher and K. Schachenmeier. He 

 was born on January 13, 1855, at Constance, where 

 his father, F. X. Lehmann, was director of the training 

 college. As an only child he spent much time in his 

 father's laboratory and was interested in his search 

 for mathematical law in organic life. He studied under 

 Kundt and Groth at Strasbourg, and after graduating 

 taught in schools in Baden and Alsace until 1883, when 

 he became lecturer and afterwards extra professor 

 at the polytechnic at Aix-la-Chapelle. After a year 

 as extra professor at Dresden he succeeded Hertz 

 as director of the physics department of the technical 

 school at Carlsruhe in 1889. He took a prominent 

 part in the meetings of the scientific society of Carlsruhe 

 and was noted for the experiments with which he 

 illustrated his lectures. He is best known in Great 

 Britain for his work on liquid crystals and for the 

 improvements he made to the microscope to facilitate 

 that work. His death occurred on June 17, 1922, some 

 time after his retirement. 



