Sentence:  Clouds sometimes <WSD>inosculate</WSD> with smoke.  Howard mentions several cases in his Journals.  "The smoke of London," he observes, "when passing away in a body swelled up into distinct heaps, each of which <WSD>inosculated</WSD> at its summit with a small Cloud.  Groups of Cumulo Stratus, the Cumulus and Cirro Stratus occupied the South part of the sky attracting smoke." 
Meaning of the word marked with <WSD> tags:  To unite.