Descendenz und Hybriden. — Physiologie. 89 



Pau, Carlos, Hybridae novae Hispaniae. (Bull, de 

 l'Acad. intern, de Geogr. bot. 1904. No. 183. p. 211—212.) 



Simbuleta composita (bellidifoUa X Dnrlminia), Brunella 

 gentianaefolia (hyssopifolia X vulgaris), Aster celtibericiis 

 (acrls X Willkommii), Astragaliis hybrldus (chlorocyaneus X 

 incnrvus), Jiiniperiis Tremolsii (macrocarpa X Oxycedriis) et 

 Frankenia aiiricnlata (laevis X Webbil). J. Offner. 



Verguin, Louis, Fumaria Biirnatij hybride n o u v e a u (F. 

 agraria X ^- capreolata). (Rev. de Bot. System, et de G^ogr. 

 bot. 1904. II. p. 121—124.) 



L'auteur a decouvert dans le Var ce nouvel hybride; il se presente 

 sous deux formes, qui se distinguent l'une de l'autre par les caracteres 

 differentieis des deux varietes de Fumaria capreolata qui leur ont donne 

 respectivement naissance: 



Forme «: F. agraria var. major Hamm. X F. capreolata var. atro- 

 sanguinea Broch. ä 1 a Valette; 



Forme ß : F. agraria var. major Hamm. X ^- capreolata var. speciosa 

 Hamm. äCarqueiranne. J. Offner. 



Barratt, T. 0. W., The Lethal Concentration of acids 

 and bases in respect of Paramoecium auralia. (Proc. 

 Roy. Sog. London. Aug. 10, 1904.) 



In 0,0001 N concentration, Hydrochloric acid, Sulphuric 

 acid, and Nitric acid are nearly equally lethai. Lactic, and 

 Oxalic acids are more lethal then the mineral acids, phos- 

 phoric, and citric less so. Weak electrolytes are lethal in much 

 more concentrated Solutions; in the case of Hydrocyanic acid 

 even reaching to 0,3 N. Weak acids are more lethal in less 

 ionic concentration than strong acids; excluding phenol dimi- 

 nution in ionic concentration proceeds at a much Iower rate 

 than increase of molecular concentration. Strong alkalis are 

 less toxic than ammonium hydroxide, and this in turn less 

 than analin. Of metallic alkalis the mean lethal concentration 

 of Potassium, Sodium, and Lithium is greater than that of 

 Calcium, Strontium, and Barium, the lethal effect running parallel 

 to the periodic order of these metals. The consideralDle diffe- 

 rence in ionic concentration both of acids and bases for nearly 

 equal toxic effect shows that such effect is not hydrolytic in 

 character, for if it were, the concentration of H+ or GH" ions 

 would be constant for each series. e. Drabble (London). 



Caldwell, R. S., „ H y d r 1 y s i s o f C a n e S u g a r b y d - and 

 l-Camphor-,i-Sulphonic acid. (Proc. Royal Soc. 

 London. Nov. 1, 1904.) 



All enzymes appear to be asymetric. Hence it is of interest 

 to determine whether there is any difference in the rate of 

 hydrolysis of a substance by iaevo- and dextro-rotatory isomers. 

 The author has experimented on Cane Sugar by means of 



