or what personal purpose could Bloom have applied the water so boiled?

To shave himself.

What advantages attended shaving by night?

A softer beard: a softer brush if intentionally allowed to remain from
shave to shave in its agglutinated lather: a softer skin if unexpectedly
encountering female acquaintances in remote places at incustomary hours:
quiet reflections upon the course of the day: a cleaner sensation when
awaking after a fresher sleep since matutinal noises, premonitions and
perturbations, a clattered milkcan, a postman's double knock, a paper
read, reread while lathering, relathering the same spot, a shock, a
shoot, with thought of aught he sought though fraught with nought might
cause a faster rate of shaving and a nick on which incision plaster with
precision cut and humected and applied adhered: which was to be done.

Why did absence of light disturb him less than presence of noise?

Because of the surety of the sense of touch in his firm full masculine
feminine passive active hand.

What quality did it (his hand) possess but with what counteracting
influence?

The operative surgical quality but that he was reluctant to shed human
blood even when the end justified the means, preferring, in their
natural order, heliotherapy, psychophysicotherapeutics, osteopathic
surgery.

What lay under exposure on the lower, middle and upper shelves of the
kitchen dresser, opened by Bloom?

On the lower shelf five vertical breakfast plates, six horizontal
breakfast saucers on which rested inverted breakfast cups, a
moustachecup, uninverted, and saucer of Crown Derby, four white
goldrimmed eggcups, an open shammy purse displaying coins, mostly
copper, and a phial of aromatic (violet) comfits. On the middle shelf
a chipped eggcup containing pepper, a drum of table salt, four
conglomerated black olives in oleaginous paper, an empty pot of
Plumtree's potted meat, an oval wicker basket bedded with fibre and
containing one Jersey pear, a halfempty bottle of William Gilbey and
Co's white invalid port, half disrobed of its swathe of coralpink tissue
paper, a packet of Epps's soluble cocoa, five ounces of Anne Lynch's
choice tea at 2/- per lb in a crinkled leadpaper bag, a cylindrical
canister containing the best crystallised lump sugar, two onions, one,
the larger, Spanish, entire, the other, smaller, Irish, bisected with
augmented surface and more redolent, a jar of Irish Model Dairy's cream,
a jug of brow