Besides his own constitutions, Euric included in this collection constitutions of his predecessors, Theodoric I.
To his delight, one of his predecessors had known of the secret portal leading to and from Hell.
Propertius's poems bear evident marks of the study of his predecessors, both Greek and Latin, and of the influence of his contemporaries.
The chief of his other contributions to optics was the explanation of the rainbow - an explanation far from complete, since the unequal refrangibility of the rays of light was yet undiscovered - but a decided advance upon his predecessors, notably on the De radiis visas et lucis (1611) of Marc-Antonio de Dominis, archbishop of Spalato.
He was the last notable representative of the New England School, in which his predecessors were the younger Edwards, John Smalley (1734-1820) and Nathaniel Emmons.