577. Parisyllables in #-ēs#, and substantives in #-ās#, #-aus#, #-is#,
#-s# preceded by a consonant, and #-x#, are feminine: as,
#nūbēs#, _cloud_; #aetās#, _age_; #laus#, _praise_; #nāvis#, _ship_;
#urbs#, _city_; #pāx#, _peace_.
578. #ās#, #assis#, _penny_, is masculine. #vās#, _vessel_, _utensil_,
and the defectives #fās#, _right_, and #nefās#, _wrong_, are neuter.
579. Substantives in #-nis# are masculine; also twenty-nine others in
#-is#, as follows:
axis, callis, caulis, anguis,
_axle_, _path_, _cabbage_, _snake_
fascis, fūstis, lapis, sanguī̆s,
_bundle_, _club_, _stone_, _blood_
piscis, postis, pulvī̆s, ēnsis,
_fish_, _post_, _dust_, _glaive_
torquis, torris, unguis, mēnsis,
_twisted collar_, _firebrand_, _nail_, _month_
vectis, vermis, vōmis, collis,
_lever_, _worm_, _ploughshare_, _hill_
glīs, canālis, also follis,
_dormouse_, _conduit_, _ball_
cassēs, sentēs, veprēs, orbis,
_nets_, _brambles_, _thorns_, plurals, _circle_
cucumis, and sometimes corbis.
_cucumber_, _basket_
#būrim#, _ploughtail_, accusative only, is also masculine. A few of the
above are sometimes feminine: as, #amnis#, #anguis#, #callis#,
#canālis#, #cinis#, #fīnis#, #fūnis#, #torquis#, #veprēs#, &c.
580. Four in #-s# preceded by a consonant are masculine: #dēns#,
_tooth_, #fōns#, _fountain_, #pōns#, _bridge_, #mōns#, _mountain_; also
factors of twelve: #sextāns#, _one sixth_, #quadrāns#, #triēns#,
#dōdrāns#, #dēxtāns#; #rudēns#, _rope_, once. #adeps#, _fat_, and
#forceps#, _pincers_, are masculine or feminine. #stirps#, _stock_, is
sometimes masculine.
581. #calix#, _cup_, #fornix#, _arch_, and #trādux#, _vinelayer_, are
masculine; also substantives in #-ūnx# and #-ex#; except #nex#,
_murder_, and #precī#, _prayer_, dative, no nominative, which are
feminine; also rarely #grex#, _herd_. #cortex#, _bark_, #forfex#,
_scissors_, #silex#, _flint_, and #obice#, _barrier_, ablative, no
nominative, are either masculine or feminine. #calx#, _heel_, and
#calx#, _lime_, are sometimes masculine, also #lūx#, _light_, in the
ablative in old Latin.
[Erratum:
577 ... substantives in #-ās#, #-aus#
#-ās# #-aus#]