title: Protocatechuic acid, the substance responsible for the hardening of the cockroach ootheca.
authors.affiliation: Entomology Department, Zoological Laboratory, and University Chemical Laboratory, Cambridge.
authors.forename: M G
authors.initials: MG
authors.lastname: Pryor
authors.forename: P B
authors.initials: PB
authors.lastname: Russell
authors.forename: A R
authors.initials: AR
authors.lastname: Todd