48 PHYSIOLOGY [BoT. Absts., Vol. X, 



Jour. Gen. Physiol. 3: 35-39. 1920. — A neutral solution of dextrose and hydrogen peroxide 

 acts like Penicilliuvi chrysogenum in producing an increased amount of CO2 upon the addition 

 of acid, but not upon the addition of alkali. — Author's summary. 



290. Inman, O. L. Comparative studies on respiration. XVI. Effects of hypotonic and 

 hypertonic solutions upon respiration. Jour. Gen. Physiol. 3: 533-537. 1921. — In highly 

 hypertonic solutions of sea water the rate of respiration of Laminaria Agardhii is very much 

 reduced as measured by CO2 production according to the Osterhout method. In highly hypo- 

 tonic solutions the rate is also reduced, but less markedly. Hypertonic solutions of NaCl, 

 CaCl2, and mixtures of the 2 in the proportion 50 : 1 caused a decrease in the respiration 

 of wheat seedlings. — Otis F. Curtis. 



291. Irwin, Marion. Comparative studies on respiration. XIII. An apparatus for meas- 

 uring the production of minute quantities of carbon dioxide by organisms. Jour. Gen. Physiol. 

 3:203-206. 1920. 



292. Itano, a., and J. Neill. A microscopic method for anaerobic cultivation. Jour. 

 Infect. Diseases 29: 78-81. 1921. — There is described a modification of the usual moist cham- 

 ber preparation, whereby anaerobiosis is obtained by the absorption of oxygen by alkaline 

 pyrogallate. — Selman A. Waksman. 



293. Nichols, H. J. The production of CO2 by the typhoid bacillus and the mechanism 

 of the Russell double sugar tube. Jour. Infect. Diseases 29: 82-85. 1921. — The typhoid 

 bacillus produces CO2 in significant amounts both from sugars and from proteins. — Selman A. 

 Waksman. 



GROWTH, DEVELOPMENT, REPRODUCTION 



294. LuYTEN, Ida. De Periodiciteit van de Knopontwikkeling bij den Pruim. [On the 

 periodicity of bud development in the plum.] Mededeel. Landbouwhoogeschool Wageningen 

 18: 103-148. PI. 2, fig. 9. 1921. — Bud development was studied with the varieties Drap 

 d'Or d'Esperen and Reine Claude. With the flower buds, a bud-scale and a flower-forming 

 period were distinguished. In May and June, 1919, the growing point of the flower buds 

 produced scales. About July 1, the growing point initiated the formation of the flower, and 

 after July 23 the formation of the difl"erent parts of the flower proceeded at a fairly rapid rate. 

 Soon after the bracts were separated from the remaining flower primordia the calyx was 

 differentiated, each flower lying in the axil of a bract. Next, the petal primordia were formed. 

 On August 29 the stamens began to appear, followed by indications of the carpel. The greatest 

 change in the carpel took place about September 20. After October no further external 

 changes occurred until about the middle of January, when growth slowly began. — With the 

 foliage leaves still in the bud, the origin of the buds of the following year became visible as 

 naked growing points. The earliest date at which the growing point in the axil of the leaf 

 could be observed was August 13. — /. C. Th. Uphof. 



295. Versluys, Martha C. De Periodiciteit van de Knopontwikkeling bij den Kers. 

 [Periodicity and bud development in the cherry.] Mededeel. Landbouwhoogeschool Wagenin- 

 gen 18: 149-191. PI. 2, fig. 10. 1921. — Flower formation was the chief object of this study, 

 made upon certain varieties of cherry as follows: Bruine Waalsche (Brown Wallon), Abbesse 

 do Mouland, and Hedelfinger Riesenkirsche. In the last named variety, especially, the 

 terminal bud usually produces a long shoot, whereas lateral leaf buds produce either short 

 shoots or longer ones effecting ramification. — In the middle of May, 1919, the flower buds for 

 the next season which had formed in the axils of the lowest leaves on a short shoot, exhibited 

 on the average 7-8 scales. On July 3 this number had increased to 17, and on July 30 to about 

 26. On August 25 petals of the flower were clearly visible, the receptacle was flat, and the 

 stamens were very vague. On September 23 the sepals touched each other; the petals were 

 broader and flatter; the stamens, appearing in 4 whorls of usually 10 each, already showed 

 a differentiation into anther sacs; and the carpel had become elevated, with the cones already 



