neutralizationof phosphoric acid the constraints, and the temperature. In the case of hydrogen sulfide the heat capacity increases with decreasing temperature, due to the heat of polymerization and to other causes. The writer wishes to express his thanks to Professor G. N. Lewis for suggesting the problem and the method of its attack.

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With atomic disintegration recognized for 20 years and atomic decomposition' now established by the work of RutherfordI2 on the impact of a-particles on light atoms, the astronomical evidence that heavy atoms are not stable a t high temperatures3 demands laboratory confirmation. This has become possible through the work of Anderson' whose method of exploding wires a t temperatures above 20,000°, well above that attributed to the hottest stars, has become valuable in spectroscopy. In our application of this method the wires were exploded within strong glass bulbs so Chat the gaseous products of the explosions could be collected for analysis. The method thus includes factors, both of cause and of error, analogous to those operative in the voluminous and inconclusive controversy on the evolution of helium in various types of lorn pressure electrical discharge tubes, extending from 1905 to 1915.

of the seed-plants do not appear to fit into tween the east and west banks. ('Every one this conception in even an approximately satis-going up the Yenisei mpst be struck with the factory manner.remarkable difference between the east and E. C. JEFFREYwest sides of the river. While the flat land on LABORATORIES OF PLANT MORPHOLOQY, HARVARD UNIVERBITY RIVER-BANK MOVEMENTS DUE TO THE EARTH'S ROTATION

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Since our first paper1 Venkataramaiah reported3 the independent discovery of the active form of hydrogen, distinguished by its ability to reduce potassium permanganate solution rapidly at room temperature. He produced it first in the alternating current corona, but made the interesting observation that it is produced in measurable quantities when oxygen is exploded in an excess of hydrogen. Since all other methods of its preparation, including those reported below, are dependent on prolonged and intense ionization of the hydrogen, this preparation by explosion is of importance in determining the mechanism of its formation.New Methods of Preparation Siemens Ozonizer.-In view of the read)r formation of the new gas by means of the electrical discharge at 10,000 to 20,000 volts and a current of 4 to 25 milli-amperes, both at atmospheric pressure and at a pressure of 4 to 8 cm. of mercury, there is little new in its successful preparation in the usual quantities of about 0.01% by means of the ordinary Siemens glass tube ozonizer, with external tin-foil electrodes. This method is simple and reliable. It is particularly effective at the temperature of boiling liquid ammonia. This method failed, however, when the ozonizer was immersed in liquid air, probably because of the increased dielectric strength of the glass walls. When metallic electrodes were inserted through the walls of the tube, the low temperature did not prevent the activation.In this, as in all the work, the hydrogen was prepared and purified as described in the previous paper. In all cases the test for activation was the formation of hydrogen sulfide in passage of the gas over cold sulfur. In every case blank tests were made to show that the hydrogen itself, without the ionizing agent, did not attack the sulfur.

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