WATER SUPPLY TO SYDNEY BY GRAVITATION 

 By Mr. James Manning. 



[Read before the Royal Society, 8 October, 1875.] 



Me. Chairman, — Before I proceed with the purpose of this 

 additional paper on the subject of water supply by gravitation, 

 I desire to tender my thanks to the Council of this Society for 

 giving me the privilege of making more deliberate replies to the 

 remarks and objections made to my project for water supply 

 than it was possible for me to have in making impromptu answers 

 to the various speakers who discussed the subject on the occasion 

 of our last meeting. Nothing but the extreme importance of 

 this really vital matter would warrant my addressing this Society 

 once more even in reply. 1 therefore trust that I may be 

 pardoned for my seeming importunity. 



Discussion on this subject has pointed out many sources of 

 objections to my plan, which I could scarcely have anticipated, 

 because of my familiarity with the localities, and of the careful 

 survey which I have made of the water supply country, and 

 the consideration which I have devoted to the subject at issue. 

 For the sake of others, however, I am glad that certain doubts 

 and objections have been raised, as they give me the opportunity 

 of perhaps allaying fears that the boon that I have said is at our 

 command is not a myth. 



Among other objections the one prominent one of insufficiency 

 of my proposed supply of water was raised. To such an import- 

 ant matter I would like to reply that my survey was carried out 

 with such care that I can repeat with perfect confidence all that 

 I have stated, namely, that my levels, my measurements for im- 

 pounding areas, and my estimates of watershed, and for water 

 supply, and for water power, are all perfectly reliable for their 

 accuracy, as far as my survey with the level and staff went, as 

 before noted. 



Before I expatiate a little more on the vexed question of the 

 insufficiency of the watersheds and of supply waters for my 

 scheme, I would wish to remark that the report of the late dis- 

 cussion, as it did then take place, made no allusion to our much- 

 esteemed Vice-President's confirmation of my statement of the 

 existing north-westerly dip of the south coast Illawarra ranges. 



