144 Obituary — Prof. A. von Lasaulx. 



work, we confidently appeal to all to raise a worthy monument to 

 his memory. 



It is proposed that this monument should consist of a marble bust 

 on a stone pedestal, protected in a suitable manner from the in- 

 clemencies of the weather, to be placed in the Botanical Gardens at 

 Zurich, on the spot where Heer's energy was so well displayed. 

 The price of the memorial would reach about 5000 francs. 



Besides which, the sculptor, M. Horbst, is prepared to execute, for 

 150 francs each, plaster casts of the original. If you desire one of 

 these copies, have the goodness to inform us, when sending your 

 contribution. Subscriptions will be gratefully received by Dr. C. 

 Schroter at Hottingen, Zurich. They may be sent direct, or through 

 the medium of the undersigned. 



Prof. Dr. A. Mousson, Polytechnikum, Zurich. 



Prof. Dr. C. Cramer, „ „ 



OBITTJABT. 



PROFESSOR A. VON LASAULX Ph.D. 



We deeply regret to have received tidings of the death of this 

 distinguished German Geologist and Mineralogist, which took place 

 at Bonn, on the 25th January last, after a short illness. Dr. Von 

 Lasaulx was only in his 47th year ; yet he had been the author of 

 a remarkably large number of Memoirs on petrological subjects, as 

 well as of more solid works, of which, perhaps, the joint work on 

 Etna of Sartorius von Waltershausen and himself is the most 

 splendid example. In 1876 Dr. von Lasaulx, in company with his 

 friend Dr. Ferdinand Koemer, of Breslau, visited the British Isles ; 

 and was present at the meeting of the British Association in Glasgow 

 in that year. On his return to Bonn, he published an account of 

 his wanderings, in the form of a handsome book, "Aus Irland, 

 Eeiseskizzen und Studien," in which the physical features and 

 geological structure of the districts visited are closely noted and 

 graphically described, together with the mineral characters and 

 composition of many of the rocks as determined under the micro- 

 scope ; of these, the most important was the discovery of tridymite 

 in the trachytic rocks of Antrim (Petrographische skizze aus Irland ; 

 mineralogischen und petrographischen Mittheilungen, Wien, 1878, 

 p. 410). The volcanic rocks of Bonn and the neighbourhood 

 afforded a rich field for the petrological investigations of this lamented 

 naturalist, of which he made abundant use. E. H. 



We regret to record the death (on the 16th February, from heart- 

 disease) of Mr. W. W. Leighton, who, since the year 1867, has 

 filled the office of Clerk to the Geological Society of London, and 

 has during 19 years been a most faithful and valued servant to the 

 Society. 



