618 Morphologie und Teratologie. — Physiologie. 



Ledoux, P., Sur l'aplatissement des organes du 

 Lathynis Orchnis DC. (Assoc. franc., Congr. de Montauban. 

 1902. p. 081.) 



Chez le L. Ochriis les germinations portent, au-dessus des. 

 cotyledons, 13 ecailles au lieu des 2 ä 4 qui se rencontrent 

 chez les Pisiim, les Vicia et les autres Lathynis. Ces ecailles, 

 dont les superieures sont les plus importantes, representent des. 

 petioles aplatis et virescents auxquels se sont soudees les 

 stipules (signalees seulement par de petites dents marginales). 

 Elles correspondent ä un retard de i'apparition des folioles 

 qu'elles suppleent. II en est de meme pour la transiormation 

 des alles caulinaires, dans lesquelles on observe des stomates, 

 un tissu assimilateur bien developpe et, entre le cylindre central 

 et le faisceau marginal (faisceau cortical habituel des Viciees), 

 un reseau de cordons libero-ligneux ä orientation variables et 

 souvent contradictoires. Lignier (Caen). 



Lloyd, F. E., A n e w a n d c h e a p f o r m o f A u x o n o m e t e r. 



(Torreya. Vol. III. p. 97 — 100. Fig. 1— 3 in text. July 1903.) 



An arrangement by which an arm_, affixed to the minute hand oi 

 a clock, is made to impinge on a lever on which the recording surface 

 is carried. An auxanometric lever, ending in a fine, ciirved point, trails 

 across this recording surface and when the latter is disturbed once an 

 hour by the movement of the clock hand, a mark is left behind. 



H. M. Richards (New-York). 



Mac DOUGAL, D. T., Some Correiations of Leaves. (Bull. 

 Torrey Bot. Club. Vol. XXX. p. 501— 512. Fig. 1—2 in text. 

 Sept. 1903.) 



Observations on the effects produced by cutting away the 

 biades of developing leaves of Prunus serotina and an Acer, 

 near the base of the petiole. The stipules, present in the case 

 of the Prunus, were left intact and the most interesting obser- 

 vations are on the behaviour of these organs. Not only is 

 the duration of these stipules much prolonged and the size oi 

 them greatly increased, but the posilion, which becomes more 

 divergent, is also altered. The loss of the lamina acts as a 

 Stimulus which induces the development of the stipules so as to 

 enormously increase their capacity for assimilatory or transpi- 

 ratory activity. In Acer the defoliation was followed by the 

 awakening of the lateral buds formed in the previous season, 

 a condition contrasting with that found in Prunus. VVhile the 

 total length of the developed defoliated branches was much 

 less than the normal, the number of internodes involved was 

 greater, and the tissues were generally found to be in a state 

 of hypoplasia. H. M. Richards (New-York). 



Ball, 0. M., Der E i n f 1 u s s von Zug auf d i e A u s b i I d u n g 

 von Festigungsgewebe. (Jahrb. für wissensch. Botanik, 

 p. 305—341. Mit 2 Tafeln.) [Leipziger Dissertation.] 



