This report presents a description of the design of the Cuatro Vientes wind tunnel.

The Bluebird is a two seat, side by side biplane, designed primarily for training and pleasure flying. A description of the construction and flight characteristics is provided.

The object of this report was to indicate that we frequently only make use of 50 percent of the maximum brake horsepower of the engine in taking off the ground, that this loss is not inevitable, and that the effort to get engines of low weight per horsepower by boosting revolutions is of very little use to bombers and commercial airplanes.

Pamphlet describing the characteristics of the alfalfa weevil, the damage it causes, and methods of control.

Describes the role of cooperative bull associations in dairy-herd improvement. Provides information about the financial benefits and advice for organizing a bull association.

It is stated that the index value 6000, as found in normal tests of wing sections with a 20 cm chord, falls in the same region where the transition of laminar to turbulent flow takes place on thin flat plates. It is to be expected that slightly cambered, thin wing sections will behave similarly. The following test of two such wing sections were made for the purpose of verifying this supposition.

"This investigation was conducted as a part of a general research on fuel-injection engines for aircraft. The purpose of the investigation was to determine the effects of fuel and cylinder gas densities with several characteristics of fuel sprays for oil engines. The start, growth, and cut-off of single fuel sprays produced by automatic injection valves were recorded on photographic film by means of special high-speed motion-picture apparatus" (p. 491).

This report concerns, first, the determination of the lift of a wing which is situated in a curvilinear flow; and second, to calculate the curvature which one wing of a biplane produces in the vicinity of the other.

A small commercial airplane, the Focke-Wulf G.L. 18 has two engines (75 HP. Junker). It is a monoplane and the engines are wing mounted. Details of the engines, power, wings, ailerons, fuselage, empennage, landing gear, characteristics, drawings, and photographs are provided.

"Attention is called in this report to previous investigations of gaseous explosive reactions carried out under constant volume conditions, where the effect of inert gases on the thermodynamic equilibrium was determined. The advantage of constant pressure methods over those of constant volume as applied to studies of the gaseous explosive reaction is pointed out and the possibility of realizing for this purpose a constant pressure bomb mentioned" (p. 479).

Describes insect pests that threaten flowering plants in the home garden.

This report presents experiments in which two parts of the wing were arranged so as to form a biplane, which was subjected to normal three-component measurements, the two parts being placed in various relative positions with respect to the gap a and the stagger b.

The G 24 is a commercial airplane with three engines and a monoplane wing. It is known for its all metal construction and stabilizers.

Brief summary of the geographic distribution, habits, history, and subgenera of Synaptomys.

The Rocco is a has a monoplane wing surmounted by two engines. Its flat sided narrow beam hull is steadied when on the water by 2 outboard wing floats. Details of the design, hull accommodation, power plant, drawings, and photographs are provided. The report is incomplete.