4 president's address. 



more important bacteriological laboratories and institutions of 

 the United Kingdom and on the Continent, during his tour. 

 Since his return, our Bacteriologist has settled down to work 

 again, and has been for some time engaged upon the verjr 

 interesting study of certain points in connection with the 

 opsonisation of Bacteria. 



Mr. H. I. Jensen, Linnean Macleay Fellow in Geology, has 

 completed his work on the geology of the Warrumbungle and 

 Nandewar Mountains, and the results will be found embodied in< 

 two important papers included in the Proceedings for last year. 

 In addition, Mr. Jensen has spent some time in Queensland 

 investigating the geology of the Mount Flinders trachyte area;, 

 and also, in conjunction with Mr. C. A. Siissmilch, upon the study 

 of the petrology of the rocks of the Canoblas, New South Wales. 

 Considerable progress has been made with these investigations, 

 and during the year Mr. Jensen expects to be ready with papers 

 treating of these important matters. At the end of the month 

 we part with Mr. Jensen as a Linnean Macleay Fellow, as he has 

 decided to take up other work. He was the first Linnean 

 Maclea} T Fellow to be appointed, and has held a Fellowship for 

 three years. He accepted his Fellowship, and has carried on his 

 work, in the spirit which prompted Sir William Macleay to 

 found Fellowships — as an aid to do work; an aid to do work 

 which could not be done so satisfactorily and promptly by anyone 

 else, unless he were a leisured individual possessed of private 

 means. Mr. Jensen undertook a big problem — the study of the 

 natural history of the volcanic rocks, and particularly of the 

 trachytes of Eastern Australia and cognate matters. He has 

 investigated it with great enthusiasm and ability, both in the 

 field and in the laboratory, and he has settled its main features. 

 He has the satisfaction of having done an excellent piece of work;, 

 and in the name of the Society I cordially offer him hearty con- 

 gratulations and good wishes for his prosperity and success in his 

 new sphere of activity. 



Dr. J. M. Petrie, Linnean Macleay Fellow in Biochemistry, 

 has almost completed his first year of work. He has finished 



