vv 1-6 : simple past (said, thought); past continuous (were coming)= PRESENT

vv 6-19: past perfect ( had seemed, had plunged); simple past (said)=PAST

vv 19-37: simple past (forgot, stiffened, thought, perched, dissolved)=PRESENT

vv 37-54: simple present (knows, sees, love)= PRESENT ( Mrs Dalloway, the protagonist,  is thinking so to think she uses the present even if Virginia Woolf sets the narration in the past).