820 EXPERIMENT STATION RECORD. [Vol. 43 



An apparent daily autonomous periodicity [in plants], L.-G. Romeix 

 {Svensk Bot. Tidskr., 12 (1918), No. 4, pp. U6-Jf63, fig. 1). — In a preliminary re- 

 port it is stated that under practically constant condition Brassica oleracea 

 exhibited a certain daily periodicity. 



Comparative studies on respiration, VII-X (Jour. Gen. Physiol., 2 (1919), 

 No. 1, pp. 1-3; pp. 5-15, figs. 5; pp. 17-2.',, figs. 3; 2 (1920), No. 4, pp. SS1-SS6, 

 figs. 3). — Four parts of this series (E. S. R., 41, pp. 524, 632) are here presented. 



VII. Respiration and antagonism, by W. J. V. Osterhout. — The development 

 of new methods for measuring respiration and photo.«!ynthesis has facilitated 

 comparative investigations regarding the antagonistic effects of salts on differ- 

 ent organisms. In this report (which is regarded as preliminary) certain im- 

 provements in the technique are discussed, and certain agreements and dis- 

 agreements in results are noted. 



VIII. The respiration of Bacillus subtilis in relation to antagonism, by M. M. 

 Brooks. — The investigations here noted were undertaken to throw light on the 

 question of the antagonistic effects of salts on certain bacteria in relation to 

 respiration. Using the apparatus previously described by Osterhout (E. S. R., 

 41, p. 524), it was found that in relatively low concentrations of sodium chlorid, 

 potassium chlorid. and calcium chlorid the rate of respiration of B. subtilis 

 remains fairly constant for several hours, while in higher concentrations a 

 gradual decrease in the rate occurs. Sodium chlorid and potassium chlorid 

 increased the respiration rate of B. subtilis somewhat at concentrations of 

 0.15 N and 0.2 N, respectively. In sufficiently high concentrations they de- 

 creased the rate. Calcium chlorid increases the rate of respiration at 0.05 N 

 and decreases the rate at somewhat higher concentrations. 



The effects of salts upon respiration show a well-marked antagonism between 

 sodium chlorid and calcium chlorid and between potassium chlorid and calcium 

 chlorid. The antagonism between sodium chlorid and potassium chlorid is 

 slight, the antagonism curve showing two maxima. 



IX. The effects of antagonistic salts on the respiration of Aspergillus niger, 

 by F. G. Gustafson. — The author has begun with A, niger a study of the rela- 

 tion of antagonistic salts to the respiration of higher fungi. 



It was found that in the presence of 0.05 per cent of dextrose the respiration 



of A. niger is increased by sodium chlorid in concentrations of 0.25 to 0.5 N 



and by 0.5 N calcium chlorid. Stronger concentrations decreased respiration. 



The decrease corresponding to higher concentrations is thought to be due to an 



1 osmotic effect of these salts. A mixture of 19 cc. of sodium chlorid and 1 cc. 



lof calcium chlorid (both at 0.5 N) showed antagonism, the respiration being 



Inormal in this case, although each salt alone caused an increase. Spores of 



1.4. niger which did not germinate on 0.5 N sodium chlorid (plus 0.05 per cent 



Idextrose) germinated on 0.5 N calcium chlorid (plus 0.05 per cent dextrose) 



^d on various mixtures of the two. This shows that a substance may have 



feffects on respiration different from those which it has upon growth. 



1 X. ToaHc and antagonistic effects of magnesium in relation to the respiration 



if Bacillus subtilis, by M. M. Brooks. — Employing technique similar to that 



described abote, the author found that concentrations of magnesium chlorid 



up to 0.01 N ha4 little effect upon the respiration rate of B. subtilis; at 0.03 N 



all increase occuis in the rate, and at higher concentrations a gradual decrease. 



A well-marked antagonism is noted between magnesium chlorid and sodium 



chlorid, also a very sUght antagonism between magnesium chlorid and calcium 



chlorid. 



Fhy to chemical inv^tlgations on indigenous and naturalized plants, I, 

 J. A. DoMiNGUEz, J. F. <i^oLFiNO, and E. L. de Gaxlelu (An. Soc. Qutm. Ar- 

 i/eniina, 7 (1919), No. 29, ^np. 5-11). — Preliminary studies are indicated as fur- 



