Juke 1, 1906.] 



SCIENCE. 



849 



On a S-Amino Quinazoline and the Corre- 

 sponding S, S'-Diquinazolyl: M. T. Bogert 

 and H. A. Seil. 



By condensing 6-nitro acetanthranil with 

 hydrazine hydrate, the authors obtained an 

 amino quinazoline and a diquinazolyl. The 

 same diquinazolyl was prepared by condensing 

 the amino quinazoline with another molecule 

 of the anthranil. The properties of these 

 compounds and of several of their derivatives 

 were described. 



The Determination of Rosin in Shellac — 



second paper: A. C. Langmuie. 



In the author's first paper published in the 

 Journal of the Soc. Chem. Ind., January 16, 

 1905, the iodine absorption of shellac under 

 certain specified conditions was taken at 18 

 per cent, and that of rosin at 228 per cent. 

 A large number of tests during the past year 

 on a great variety of shellacs and rosins con- 

 firm the values taken at that time. The 

 Hanns solution may be used in place of the 

 Wiji solution, and the same values hold good. 

 The Hubb solution still advocated by Parry 

 should be abandoned, as its use in the deter- 

 mination of rosin has all the inaccuracies 

 established in the case of fat analysis and to 

 a greater extent. 



An Electrical Resistance Furnace for the 

 Measurement of Higher Temperatures with 

 the Optical Pyrometer: Alexander Lampen. 

 The substance under investigation is intro- 

 duced into a small graphite capsule, which is 

 put in the end of a graphite sliding tube, and 

 this is slipped into a fixed horizontal tube 

 heated in a resistance furnace. The pyrom- 

 eter is sighted on the capsule through the 

 sliding tube. A rough regulation of the tem- 

 perature is made by varying the current and 

 the fine regulation by moving the capsule to 

 a hotter or cooler zone of the tube. Tempera- 

 tures up to 2500° C. can be obtained. Besides 

 melting points of several refractory materials, 

 the following temperatures were determined. 

 Keaction point between C. and SiO^ about 

 1615° C. Crystallization temperature of C. 

 Si— between 1900° and 2000° 0. Decomposi- 

 tion point of C. Si— between 2200° and 2240° 



C. Eeaction point between C. and CaO about 

 1725° C. 



The Measurement of Temperature in the 

 Formation of Carhorundum: S. A. Tucker 

 and Alexander Lampen. 

 The purpose of this investigation was to 

 determine the temperature for the formation 

 of carborundum, and its decomposition into 

 graphite. The furnace was built on the gen- 

 eral plan of a large scale carborundumi fur- 

 nace, and was provided with a graphite tube 

 passing transversely through the core and 

 charge. This tube contained a graphite plug 

 which could be pushed to any desired position 

 in the tube. On running the furnace, the 

 plug is raised to a certain temperature de- 

 pending upon its position in the tube. For 

 different positions this temperature was de- 

 termined by an optical pyrometer. After 

 taking down the furnace, measurements were 

 made of the layers of carborundum, graphite, 

 siloxicon, and thus gave the temperature at 

 which these changes take place. It was found 

 as an average that the temperature for the 

 formation of carborundum was 1950° C, and 

 for its discomposition in graphite and silicon 

 2220° C. 



F. H. POUGH, 



Secretary. 



DISCUSSION AND CORRESPONDENCE. 



THE ORIGIN OF THE SMALL SAND MOUNDS IN THE 



GULF COAST COUNTRY. 



To THE Editor of Science: Allow me to 

 express my assent to Professor R. T. Hill's re- 

 jection of some theories recently advanced to 

 explain the origin of the small sand mounds 

 in the gulf coast country. No one who is 

 familiar with the appearance of the mounds 

 formed by uprooted trees would for moment 

 regard the sand mounds in the south as having 

 been produced by such a process. Nor do I 

 believe they can be the product of human 

 industry. 



Hill's notes on their geographic occurrence 

 are interesting. Allow me to add some data, 

 which I secured relative to these mounds 

 three years ago, near the little village of Olivia 

 in Calhoun County, Texas. I measured the 



