Watt’s introduction to Dr. Roebuck--Begins business as surveyor--Surveys canals--Partnership with Roebuck in the engine--Difficulties in constructing the engine--Watt’s visit to Kinneil--A patent determined on--Watt’s despondency--Continues his improvements--Learns German--Correspondence with Dr. Small--Specification of patent lodged--Watt erects a trial engine--The washhouse behind Kinneil--The engine completed--Its defects--Roebuck’s embarrassments--Watt accepts engagement to superintend canal works--Employed in various surveys--Designs Hamilton Bridge--Supplies plans for dock and pier at Port Glasgow and harbour at Ayr--Illness and death of Mrs. Watt--Dr. Roebuck’s ruin--Turning point in Watt’s fortunes 138–158 CHAPTER IX. Birmingham in early times--Its industry--Roads--William Hutton--The Boulton family--Matthew Boulton begins business--His trade correspondence--His marriage--His love of business--Snow-hill and Soho--Partnership with Fothergill--Aims at excellence in his productions--Emulates Wedgwood--Surpasses French art-manufacturers--His royal and noble patrons--Employs the best artists--Visits of foreigners at Soho--Extension of business--Promotes canals--His vast business--Commercial panic--Boulton’s scientific pursuits 161–181 CHAPTER X. Water- and horse-power at Soho--Boulton’s correspondence with Benjamin Franklin concerning fire-engine--Boulton’s model--Correspondence with Dr. Darwin and Dr. Roebuck--Watt visits Soho--First meeting of Boulton and Watt--Correspondence of Boulton and Watt, and of Dr. Small and Watt--Dr. Roebuck visits Boulton--Watt’s anxiety for Boulton to join him--Watt’s discouragements--His continued experiments and their failure--Watt engineer for the Monkland Canal--Commercial panic--Watt loses employment as canal engineer--Roebuck’s failure--Terms of proposed partnership between Watt, Small, and Boulton--Roebuck’s share in Watt’s engine transferred to Boulton--Watt’s arrival at Birmingham 182–198 CHAPTER XI. Characteristics of Matthew Boulton--Contrast between him and Watt--Boulton’s friends--Watt’s engine at Soho--Boulton’s views of engine business--The Kinneil engine re-erected at Soho--Works successfully--Inquiries for pumping-engines from the mining districts--Proposed extension of patent by an Act--Watt in London--Death of Dr. Small--Watt invited to Russia--Application to Parliament for extension of engine patent--Application opposed--Watt’s arguments--Act obtained--Watt returns to Birmingham--The manufacture of engines begun--The Wilkinsons--First iron vessel 199–213 CHAPTER XII.