part 1] AjS^niyersaey address or the president. Ixiii 



of liis translation and abridgment of Kosenbusch's ' Mikro- 

 skopische Physiographie der Petrographiscli Wichtigen Mineralien,' 

 published in 1S8S. 



We have now reached the third and last period of his scientific 

 life. The first few years were largely occupied in the preparation 

 for publication of his treatise on Igneous liocks, the material for 

 which had no doubt been mainly collected during the previous 

 period. The first volume, dealing with general principles, appeared 

 in 1909, and the second — a systematic description of igneous rocks,^ 

 with special reference io their chemical and mineralogical charac- 

 teristics — in 1918. In 191-1 he delivered the Silliman Memorial 

 Lectures, which were published in the same year by the Yale 

 Univei'sit}^ Press under the title of ' The Problem of Vulcan ism.' 



Iddings travelled widelv, and always with the object of increasing 

 his knowledge of igneous phenomena past and present. He visited 

 England on several occasions — first towards the end of the eighties 

 of last century, and finally in June 191-1, when he delivered a 

 course of lectures at University College. During one of these 

 visits the present writer spent two or three days with him in 

 North Wales, where he became much interested in the Paleozoic 

 equivalents of the Tertiary i-hyolites of Yellowstone Park which 

 he had recently studied. On leaving us in 1914, he succeeded, 

 despite the war, in carrying out a plan which he had formed of 

 visiting the East Indies and some of the volcanic islands of the 

 South Pacific. 



He had been elected a Foreign Correspondent in 1S9-1< and 

 Foreign Member in 1904. 



He made lasting friendships wherever he went, both with the 

 old and with the young. Although unmariied, he was fond of 

 children, with whom he rapidl}^ established cordial relations, delight- 

 ing them with stories of the Far West and other places that he 

 had visited. He was a careful, conscientious, philosophic Avorker, 

 with many interests outside his own special subject, such as music 

 and other branches of Natural History. He made no secret of his 

 sympathies with us during the war, and took pleasure in hoisting 

 the Union Jack alongside the Stars and Stripes at his country 

 house on ' British Hay.' Shortly before his death on September 

 8th, 1920, at Brinklow, he wrote an introduction to a posthumous 

 vokmie of poems by his sister, Lola La Motte Iddings, a blithe 

 spirit whom it was also a privilege to know. It concludes with a 

 quotation from one of the poems — ' Up Spirit ! Greet the new day 

 with a song.' [J. J. H. T.] 



