"'The sanitary engineer from Cannes has examined everything. The drainage is simply perfect––––'"

Cannes is the origin location of the Sanitary Engineer that inspects the drainage. Miss Elderson references him at the end of Chapter II to buttress her argument that Lota should not be sick because of the Imperial advances made to Prange Grove. 

"...He told me that we could take her no better place between Genoa and Marseilles..."

This quote refers to taking Lota to Taggia for her health, and relates to the idea that moving to warmer climates is beneficial for health, mentioned in the Taggia location tag. 

"I knew the magnet which attracted him not to quit San Remo rather than go to Monte Carlo or Nice" 

"The doctor tries to laugh away my fears, but he owns that I am below par—meaningless phrase—talks of nervine decay, and suggests my going to St Moritz"