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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[*] 296. Demonstrative Pronouns are used either adjectively or substantively.

As adjectives, they follow the rules for the agreement of adjectives and are called Adjective Pronouns or Pronominal Adjectives (§§ 286, 287):—
1. hōc proeliō factō, after this battle was fought (this battle having been fought).
2. eōdemproeliō, in the same battle.
3. ex eīsaedificiīs, out of those buildings.
As substantives, they are equivalent to personal pronouns. This use is regular in the oblique cases, especially ofis:—
1. Caesar et exercitus êius, Cæsar and his army (not suus ). [But, Caesar exercitumsuum dīmīsit, Cæsar disbanded his [own] army.]
2. “sī obsidēs abeīs dentur ” (B. G. 1.14) , if hostages should be given by them (persons just spoken of).
3. hī sunt extrā prōvinciam trāns Rhodanum prīmī; (id. 1.10), they (those just mentioned) are the first [inhabitants] across the Rhone.
4. ille minimum propter adulēscentiam poterat (id. 1.20), he (emphatic) had very little power, on account of his youth.

[*] a. An adjective pronoun usually agrees with an appositive or predicate noun, if there be one, rather than with the word to which it refers (cf. § 306):—

1. “hīc locus est ūnus quō perfugiant; hīc portus, haec arx, haec āra sociōrum ” (Verr. 5.126) , this is the only place to which they can flee for refuge; this is the haven, this the citadel, this the altar of the allies.
2. “rērum caput hōc erat, hīc fōns ” (Hor. Ep. 1.17.45) , this was the head of things, this the source.
3. “ eam sapientiam interpretantur quam adhūc mortālis nēmō est cōnsecūtus [for id. ..quod] ” (Lael. 18) , they explain that [thing] to be wisdom which no man ever yet attained.