DEFINITE evidence on bird behaviour is ever valuable, especially as regards agriculture, and Mr. A. Roebuck, of the Midland Agricultural College, has done well to put on record in the form of a leaflet five cases in which birds gave help to the farmer ("Birds in Agriculture." By A. Roebuck. Midland Agricultural College, Sutton Bonington). Rooks, lapwings and blackheaded gulls were the species that in these instances did much good work with regard to wireworms (Agriotes obscurus), dungbeetles (Aphodius pinetarius and A. inquinatus), leatherjackets (Tipula paludosa) and cutworms (Agrotis segetum). Of course, it has long been known that these birds take such agricultural pests, but here we have facts lucidly set forth that show how useful they are in the economy of the farm.