APPENDIX II. clix 



are interesting and valuable. Amongst these may be mentioned 

 the article ' Bridges,' written by him for the ninth edition of the 

 ' Encyclopaedia 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 

 'Transactions' of that Society in 1869. But perhaps the most 

 important of all is his paper ' On the Application of Graphic Methods 

 to the Determination 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 required to constitute from Reulaux's kine- 

 matic system a full machine receiving energy and doing work. 



II. 



NOTE ON THE WORK OF FLEE MING JENKIN IN CON- 

 NECTION WITH SANITARY REFORM. 



By Lieutenant- Colonel ALEXANDER FERGUSSON. 



It was, I believe, during the autumn of 1877 that there came to 

 Fleeming Jenkin the first inkling of an idea, not the least in import- 

 ance of the many that emanated from that fertile brain, which, with 

 singular rapidity, took root, and under his careful fostering expanded 

 into a scheme the fruits of which have been of the utmost value to his 

 fellow- citizens and others. 



The phrase which afterwards suggested itself, and came into use, 

 ' Healthy houses,' expresses very happily the drift of this scheme, and 

 the ultimate object that Jenkin had in view. 



In the summer of that year there had been much talk, and some 

 newspaper correspondence, on the subject of the unsatisfactory condi- 

 tion of many of the best houses in Edinburgh as regards their sanitary 

 state. One gentleman, for example, drew an appalling picture of a 

 large and expensive house he had bought in the West-end of Edin- 

 burgh, fresh from the builder's hands. To ascertain precisely what 

 was wrong, and the steps to be taken to remedy the evils, the effects 



