The Allen and Greenough is still under construction;
so some links may not work quite the way you would expect.
Ablative of Manner.
412. The Manner of an action is denoted by the
Ablative; usually with cum, unless a liraiting adjective is used with the
- cum celeritAte venit, he
came with speed. But,
- summi celeritAte v*nit, he came
wifh the greatest speed.
- quid re-fert quA me- rati5ac ce-gatis
(Lael. 26), what d*erence does it make i', what way you compel
a. But cum is often used even when the
ablative has a hmiting adjective :
- quant5 Id cum pencu15 fe-cent
(B. G. i. 17), at what risk he did this.
- ne-n ruinare cum taedlo recubant
(Pun. Ep. ix. 17.8), they recline with no l weariness.
b. With such words of manner as mod5,
pact5, rati*ne, ritu, vi, and with stock expressions which have become
virtually adverbs ( silentli, jure, inillrii), cum is not used:
- apis Matina. mbre modbque carmina
fingo- (Hor. Od. iv. 2.28), in the sty and manner of a
Matinian bee I fashion songs.
NOTE: So in poetry the ablative of manner often omits cum: as, - insequitur
mulS aqua. me-us (Aen. i. 105), a mountain of water follows
in a mass. *f murm (id. i. 1:4); rbnis
(id. 1 123).