A signed Roman dominating function on the digraphD is a function f : V (D) −→ {−1, 1, 2} such that ∑ u∈N−[v] f(u) ≥ 1 for every v ∈ V (D), where N−[v] consists of v and all inner neighbors of v, and every vertex u ∈ V (D) for which f(u) = −1 has an inner neighbor v for which f(v) = 2. A set {f1, f2, . . . , fd} of distinct signed Roman dominating functions on D with the property that ∑d i=1 fi(...

Librarian of the National Library ofWales, and used to illustrate the lecture at Cardiff. The initial article is a scholarly account of Thomas Baskerville, Elizabethan apothecary of Exeter, by Margery Rowe and G. E. Trease. To a Welsh reviewer, another pleasing feature of the Transactions is that it has been printed by J. D. Lewis and Sons Ltd., Gomerian Press, Llandysul. They have already done...