Allen and Greenough's New Latin Grammar for Schools and Colleges
J. B. Greenough, G. L. Kittredge, A. A. Howard, Benj. L. D'Ooge, Ed.

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[*] 402. Verbs compounded with ā, ab , dē , ex , (1) take the simple Ablative when used figuratively; but (2) when used literally to denote actual separation or motion, they usually require a preposition (§ 426. 1):—

1. (1) “cōnātū dēsistere” (B. G. 1.8) , to desist from the attempt.
2. “dēsine commūnibus locīs ” (Acad. 2.80) , quit commonplaces.
3. abīre magistrātū, to leave one's office.
4. abstinēre iniūriā, to refrain from wrong.
5. (2) ā “prōpositō aberrāre” (Fin. 5.83) , to wander from the point.
6. “dē prōvinciā dēcēdere ” (Verr. 2.48) , to withdraw from one's province.
7. ab iūre abīre (id. 2.114), to go outside of the law.
8. “ex cīvitāte excessēre ” (B. G. 6.8) , they departed from the state. [But cf. fīnibus suīs excesserant (id. 4.18), they had left their own territory.]
ā māgnō dēmissum nōmen Iūlō; (Aen. 1.288), a name descended (sent down) from great Iulus.

For the Dative used instead of the Ablative of Separation, see § 381. For the Ablative of the actual place whence in idiomatic expressions, see §§ 427. 1, 428. f.

[*] a. Adjectives denoting freedom and want are followed by the ablative:—

1. “urbs nūda praesidiō ” (Att. 7.13) , the city naked of defence.
2. “immūnis mīlitiā ” (Liv. 1.43) , free of military service.
3. plēbs orba tribūnīs (Leg. 3.9), the people deprived of tribunes.

[*] Note.--A preposition sometimes occurs:—

ā culpā vacuus (Sall. Cat. 14), free from blame.
1. “līberī ā dēliciīs ” (Leg. Agr. 1.27) , free from luxuries.
2. “Messāna ab hīs rēbus vacua atque nūda est ” (Verr. 4.3) , Messana is empty and bare of these things.

For the Genitive with adjectives of want, see § 349. a.

Ablative of Source and Material