226 EXPEEIMENT STATION KECORD. 



free oxid l)y iiltration, and the separate determination of the arsenious oxid in the 

 filtrate and in tlie residue. 



Titration with potassium iodate, L. W. Andrews [Jour. Amer. Chem. Soc, 16 

 {I'JOS), No. 7, pp. 7'>G-7G1). — The nietliod proposed is based upon the titration of 

 potassium iodid, for example, with jiotassium iodate in i)resenee of a large excess 

 of hydrochloric acid, using chloroform or carbon tetrachlorid as indicator. The 

 author has ada]ited the method to the determination of iodids, free iodin, chromates, 

 chlorates, antimony, arsenic, and iron. The method "is adapted to the determina- 

 tion of almost all the substances to which Bunsen's process of distillation with 

 potassium iodid and hydrochloric acid is applicable, with at least equal precision, 

 with less expenditure of time and far simpler apparatus. It is furthermore appli- 

 cable in certain cases in which the Bunsen method is not, as, for examjjle, the 

 titration of arsenic or antimony in the presence of copper and ferric comp(junds." 



Chemistry of dyestuffs, G. von Georgievics, trans, by C. Saltkr {London: 

 Scott, (h-aenvood <.(■ Co., 1903, pp. YI-\r402). — A translation of the second German 

 edition. 



The chemical industry in Germany, E. L. Harris {TJ. S. Comular lipts., 72 

 {1903), Xo. 275, j)p. 527-536). — Statistical information on this subject. 



Report of the senior analyst for the year 1902, C. F. Juritz ( Cape Town, 1903, 

 pp. 73). — During the year analyses were made of 1,568 samples, including milk, but- 

 ter, cheese, coffee, wine, water, soils, fertilizers, coal, etc., the results being reported 

 in this ]iul)lication and discussed. 



BOTANY. 



Studies in the Cyperaceae, T. Holm {Amer. Jour. Set., 4. ser., IG {1903), No. 91, 

 pp. 17-44, fig^- 14). — The author gives the results of his extended study of the genus 

 Carex as rejiresented in Colorado, giving a synopsis of species and a description, 

 together with critical notes on all material known to exist within that State. In 

 addition he discusses the geographic; distribution of the species, comparing the dis- 

 tribution of the sedges from the Arctic region, Europe, and portions of the Rocky 

 Mountains. 



Influence of various stimulants on the respiration of plants, Y. Zalvesski 

 {Zap. Novo-Ale.Kundri Inst. Selsl: Khoz. i Lyesov, 15 {1903), No. 2, pp.' 1-41; ubs. in 

 Zhur. Opuitn. Agron. [Jour. Expt. Lcnidw.], 4 {1903), No. 3, jjp. 351, 55^).— After 

 having determined the respiratory energy of gladiolus bulbs, the author made a 

 study of the effect of various stimulants as shown by the modification of their respi- 

 ration. In the first series the bulbs were subjected to the influence of ether. This 

 was found to act as a marked stimulant, the influence of the ether being shown by a 

 curve which expresses the influence of the ether on the respiration of the bulb, being 

 one of excitation or depression when the respiration was above or below normal. 

 Very large quantities of ether tend to diminish the respiration of the bulbs. 



In the second experiment the influence of change of temperature was studied and it 

 was found that transferring the bulbs for 2 hours from a temperature of 16.8° C. to one 

 of from 38 to 38.8° increased the respiration. After a number of days the respiration 

 returned to its normal state. If the bulbs be kept at 38 to 40° for a considerable time 

 the respiration is considerably lowered. This depression, however, is attributed not 

 to the injury caused the bulbs, but to their continued drying. Bulbs so treated, after 

 being placed 4 hours in w'ater, regained their energy of respiration. From this the 

 author is led to conclude that water absorbed by bulbs acts as a stimulus in raising 

 the respiration for a time. Other investigations were carried on to determine the 

 effect of air pressure and the influence of mechanical injuries on plant respiration. — 



r. FIREMAX. 



Stimulants of plant g-rowth and their practical application, O. Loew ( Lwjirfw. 



