204 EXPERIMENT STATION RECORD. [Vol. 43 



"A gradual cumulative adaptation through a nunibor of jtenerations cultivated 

 on this substrate could not be d(Hnonstrated with any degree of certainty." 



Substitutes from the plant kingdom, edited by L. Diet.s (Ersatzstoffc ana 

 (Icm rfl<in::cnreich. Stvttf/art: E. Scliweiz'crhart, 191H, pp. [6]+^/JfiS, ////.s. J^12).^ 

 This reference book, compiled by L. Diels, E. Clilg, P. Graebner, H. Harms, T. 

 Loesener, and E. Aldrich, contains Itotani^al descriptions of plants native to 

 Oermany from which can be prepared substitutes for ordinary food and indus- 

 trial materials, together with chemical analyses in many cases of the resnlting 

 substitute. The subject matter is treated under the following headings : Salads 

 and herbs, feeding stuffs, sugar, fruit, starches and flour, legumes, yeasts, mush- 

 rooms, fats and oils, alcoholic beverages, alkaloid-containing beverages, tobacco, 

 spices, medicinal substances, soap substitutes, gums, rubber and gutta percha, 

 resins, essential oils, textile materials, silk, and wood. 



Occurrence of iodin in plants, E. AVinterstein {Hoppe-Fieyler's Zfftclir. 

 PhynioL Clieni., J04 (1918), No. 1, pp. 54-58).— The method emp'oyed in deter- 

 mining the presence of iodin in plants consisted essentially in ashing the suli- 

 stance in alkaline solution, separating the iodids from the other salts by shaking 

 with 95 per cent alcohol, evaporating the alcohol, dissolving the dry iodids in 

 water, and treating the aqueous solution with nitrosyl sulphuric acid and 

 chloroform, the iodin coloring the chloroform a deep red. 



Small amounts of iodin were found in beets, potatoes, celery roots, head 

 lettuce, and carrots. No iodin could be detected in the leaves of yew, pine, 

 silver fir, beech, chestnut, nettle, spinach, cress, cherry, red clover, and grape- 

 vine ; in the seeds of maize, rice, oats, barley, rye, wheat, chestnut, hemp, buck- 

 wheat, white and blue lupine, vetch, peas, soy beans, garden beans, pumpkin, and 

 horse chestnut; in the fruit of apple, pear, and cherry; or in three varieties 

 of mushrooms, eight samples of milk, and five varieties of cheese. 



lodometric studies, I. M. Kolthoff {Pharm. Wcekbl., 56 (1919), Kos. 25, pp. 

 878-888; 27, pp. 9J,9-959 ; 30, pp. 1629-1035; 37, pp. 1298-1300; 38. pp. 1322- 

 1326; 40, pp. 1366-1.373; 42, pp. U13-U20 ; U, pp. H66-1J,70; 47, pp. 1565- 

 1568; 49, pp. 1618-1626; 57 (1920), No. 3, pp. 53-68; abs. in Chem. .ihs., 13 {1919), 

 No. 23, pp. 3103, 3104; 14 (1920), Nos. 1, pp. 34, 35: 5, np. 504, 505).— In con- 

 tinuation of the lodometric studies previously noted (E. S. R., 41. p. 504) the 

 following topics are discussed : IX, The stability of sodium thiosulphate solu- 

 tions ; X, the determination and preservation of hydrogen peroxid solutions ; 

 XI, the determination of iodids; XII, the determination of iodids, bromids, and 

 chlorids in the presence of one another ; XIII, lodometric determination of 

 arsenic acid; XIV, the titration of sulphurous acid and its salts; XV, the 

 iodometric determination of sulphids; XVI, the determination of tin (with R. 

 Heijde) ; XVII, the determination of iron ; XVIII, the determinatitm of ferri- 

 cyanids and ferrocyanids ; and XIX, the idiometric determination of acids. 



A new 0.1 N calomel electrode design, A. E. Koehi.er {Jour. Biol. Client., 

 41 {1920), No. 4, pp. 619, 620, fly. i).— The electrode described is said to over- 

 come the difTiculties of change in normality of the n/10 KCl and of the tendency 

 of the saturated KCl to creep. By a system of stopcocks the reservoirs con- 

 taining the n/10 and saturated KCl may be connected with the H electrode 

 when readings are to be made, after which, by proper manipulation, the sec- 

 tions between the two reservoirs may be thoroughly washed out with fresh 

 solutions from the reservoirs. An illustration is given of the essential features 

 of the apparatus. 



Studies on the quantitative determination of very small amounts of cal- 

 cium magnesium and phosphorous in animal substances, L. Dienes 

 {Biocliem. Ztschr., 95 {1919), No. 3-4, pp. 131-145). — A critical study is reported 



