Thermistor bead thermometers and anemometers were used to record the micrometeorological changes in temperatures and wind speeds in the jungles of Panama. Twenty-four hour continuous observations were made through a layer of atmosphere up to 160 feet from which temperature and wind-speed gradients were determined above and below the canopy. Graphs are supplied to show hourly and vertical trends.

Thermistor beads are used as the sensitive elements for measuring temperature and wind speed. Their high resistance makes it unnecessary to correct for the resistance of leads or the change in their resistance due to temperature. Because of the high negative temperature coefficient of resistance of thermistor material slight changes in ambient temperatures caused sufficient changes in the bead resistance to unbalance a bridge circuit and thereby activate a recording milliammeter which had been calibrated to read temperatures. The change in resistance of a hot bead by the wind activated a second milliammeter which was calibrated to read wind speed.

HE following article is not intended to contribute anything new on the theory of vibrating bodies or of Lissajous figures but it is a description of a refined method of using a double pendulum for the production of these figures and the making of them into a permanent record. The beauty and design of the many patterns produced should be of interest to the scientist and teacher, as well as to the artist, and all interested in unique design.Lissajous curves or figures could be just as properly called Bowditch curves or figures since a Yankee, Nathaniel Bowditch of navigation fame, as early as 1815 produced similar curves by a pendulum suspended from two points. The American Academy of Arts Science Memoirs • carries an article by him and one by James Dean, Professor of Mathematics and Natural Philosophy, University of Vermont, in which were announced the invention and description of the double pendulum. It consisted of a Y-shaped affair having different oscillating lengths at right I-COMPOUND Fro. 1. Diagram of double pendulum and light housing.

THIRD:-AGREEM_ENT OF INDEPENDENT OBSERVATIONS MADE BY DIFFERENT PERSONS Date Name of person Reverberation July 29 J.J. Toronto 4.69 sec. 4.68 " 4.62 " REVERBERATION AND ABSORPTION I)OWER By making use of Sabine's formula at=k, (1) (a) being the total absorbing power of walls etc., t the period of re

The frequency with which Cumulus is observed during the winter months has caused considerable comment. It is noticeable that some observers hesitate to identify the formations as Cumulus, but the visible diurnal changes make their identity unmistakable.The effect of topographical conditions in this locality is indicated by lenticular structures and wave formations in all levels. During the fall months lenticular structures appear in the same positions each day for weeks.It is hoped that, through a continuation of meteorological photography in this area, a collection of photo-