Others may help; I don't have Julius's book. As for macrons, the Romans didn't use them because the Roman's didn't need them,—they already spoke Latin or had the evidence for distinguishing vowel length everywhere in considered speech. Novice Latin learners need them. It's a good excuse for offering less.
De isto libro quem non habeo, alii te adjuvent. De macronibus, opus sunt tironibus; non autem romanis qui ubique in sermonibus usitatis rectisque discrimen inter vocales longas et correptas audire possunt. Ea inficiari patiatur minus offerre.
I'm writing in Latin hoping for correction, and not because I'm confident in how I express myself. Latinè scribo ut ab omnibus corrigar, non quod confidenter me exprimam.