180 PHYSIOLOGY [Bot. Absts. 



1247. Lundegardh, Henrik. Uber Beziehungen zwichen Reizgrosse und Reaktion 

 beider geotropischen Bewegung und uber den Autotropismus. [Stimulus magnitude and 

 reaction in geotropic movement, also autotropism.] Bot. Notiser 1918: 65-118. Fig. 1-18. 

 March, 1918. 



REGENERATION 



1248. Loeb, Jacques. The physiological basis of morphological polarity in regeneration. 

 II. Jour. Gen. Physiol. 1 : 687-715. 1919. — The mass of the leaf attached to the stem influ- 

 ences the mass of air roots formed. Darkened leaves do not increase the mass of roots formed. 

 When a stem is suspended horizontally, the roots come from the under side, except at the cut 

 end where they appear around the whole circumference of the stem. If the under half of a 

 horizontally suspended stem be removed, then roots appear on the upper half. — /. M. Brannon. 



TEMPERATURE RELATIONS 



1249. Akerman, A. Uber die Bedeuting der Art des Auftauens fur die Erhaltung gefro- 

 rener Pflanzen. [Significance of the manner of thawing in the recovery of frozen plants.] Bot. 

 Notiser 1919:49-64; 105-126. 1919. 



TOXIC AGENTS 



1250. Arnould, A. Dommages causees aux vegetaux par les fumes industrielles. [Dam- 

 ages caused to plants by industrial fumes.] [Rev. of: Holmes, J. A., E. C. Franklin, and 

 R. A. Gould. Report of the Selby Smelter Commission, U. S. Dept. Interior, Bur. Mines 

 Bull. 98:1-528. PI. 1-41, fig. 1-14. 1915.] Rev. Eaux et Forets 57:121-125. 1919— See 

 Bot. Absts. 3, Entries 513 and 1150. 



ELECTRICITY AND MECHANICAL AGENTS 



1251. Merchan, A. Informe sobre tratamiento electrico de semillas antes de la siembra. 

 [Electrical treatment of seed.] Revist. Agric. Com. y Trab. 2: 199-201. 1919.— A review is 

 given of work done in England by H. E. Fry who treated seeds by passing an electric current 

 through a salt solution containing the seeds. Good results were secured with seeds of oats, 

 wheat, barley, and corn. Notes on the apparatus and results are included. — F. M. Blodgett. 



MISCELLANEOUS 



1252. Butterwick, A. J. S. The use of Atlas preservative to kill trees. " Indian Forester 

 45: 22-25. 1919.— See Bot. Absts. 3, Entry 521. 



1253. Ciamician, G. Comparazioni e ravvicinamenti. Acqua ed ammoniaca. [Com- 

 parisons and similarities. Water and ammonia.] Gaz. Chim. Italiana 49: 10-16. 1919. — A 

 study of water and ammonia from a stochiometrical standpoint. The similarity in behavior 

 of H 2 0, — OH, = 0, to NH 3 , — NH 2 , and = NH, in the formation of hydrogen peroxid, 

 hydroxylamin, hydrazin. In the formation of C = O, C = NH, and various cyanide deriva- 

 tives, urea, carbamic acid, guanidine, isoureic ether, as well as dicyandiamide, biuret, and 

 the nitril derivatives of HCN. — A. Bonazzi. 



1254. Fred, E. B. The growth of higher plants in soils free of microorganisms. Jour. 

 Gen. Physiol. 1:623-629. 1919. — A method for sterilizing seeds is described and also an 

 apparatus for growing plants under sterile conditions. — J. M. Brannon. 



1255. Gertz, Otto. Anomalier hos rhizoiderna a grodd-knoppar af Lunaria cruciata L. 

 [Anomalies in the rhizoids on the gemmae of Lunaria cruciata L.] [Swedish, with German 

 resume.] Bot. Notiser 1918: 141-150. Fig. 1-21. 1918.— See Bot. Absts. 3, Entry 1118. 



