Ill 



edition was published, after there had already appeared two foreign 

 editions, one in Italian and the other in German. 



His papers on purely engineering subjects, though not numerous, 

 are interesting and valuable. Amongst these may be mentioned the 

 article " Bridges," written by him for the ninth edition of the " En- 

 cyclopeedia Britannica," and afterwards republished as a separate 

 treatise in 1876; and a paper "On the Practical Application of 

 Reciprocal Figures to the Calculation of Strains in Framework," read 

 before the Royal Society of Edinburgh, and published in the " Trans- 

 actions " of that Society in 1869. But perhaps the most important of all 

 is his paper " On the Application of Graphic Methods to the Determi- 

 nation of the Efficiency of Machinery," read before the Royal Society 

 of Edinburgh, and published in the " Transactions," vol. xxviii (1876- 

 78), for which he was awarded the Keith Gold Medal. This paper 

 was a continuation of the subject treated in " Reulaux's Mechanism," 

 and, recognising the value of that work, supplied the elements re- 

 quired to constitute from Reulaux's kinematic system a full machine 

 receiving energy and doing work. 



Professor Jenkin's activity was not, however, confined to purely 

 scientific pursuits. The very important practical subject of healthy 

 houses lai^gely engaged his attention during the last eight or ten years 

 of his life, and he succeeded so well in impressing its importance on 

 public opinion, that he obtained the establishment in many large 

 towns of Sanitary Protection Associations, He also took great interest 

 in technical education, and was always ready in word and deed to 

 aid in its promotion. His literary abilities were of no mean order, 

 and as a critic he made several marked successes, among which his 

 reviews of Darwin's " Origin of Species " and of Munro's " Lucretius " 

 (the atomic theory) may be referred to as of high scientific merit. 



He was elected a Fellow of this Society in 1865 ; he was also a 

 Vice-President of the Royal Society of Edinburgh, a Member of the 

 Institution of Civil Engineers, and of the Institution of Mechanical 

 Engineers, and in 1883 he received the honorary degree of LL.D from 

 the University of Glasgow. He died on the 12th of June, 1885, after 

 a few days' illness, due to a slight surgical operation. W. T. 



F. G. J. Henle. Of the great anatomists and physiologists whose 

 discoveries made the middle of the present century a never-to-be- 

 forgotten epoch in the history of biology, one of the greatest died 

 on the 13th of last May at Gottingen. Frederick Gusfavus Jacob 

 Henle was, in the earlier years of his career, the most distinguished 

 of living pathologists, and, indeed, founded the Science of Pathology 

 as we now understand it. The " Manual of Rational Pathology," 

 published in 1846, was the first important work in which the observed 

 clinical and anatomical facts of disease were classified and brought 



