Garcke, Zwei Ersatzblätter in Liimc's Species plantaram. 5 



No. III and No. IV not only to compare the results of the day 

 and night growths, but also to note the results of variations of 

 temperature. The mean night growth of No. III and No. IV 

 Leaves was l 1 /« inch, and the mean daily growth was 2 4 /5 incli, 

 which shows that about 70 per cent of the total growth took place 

 during the day, between 7 : 30 A. M. and 5 : 30 P. M. It also 

 ü.ustrates the effect of length of day. 



The effect produced by variations of either day or night 

 temperatnres it is not easy to decide. In example No. I leaf it is 

 strongly indicated that the sudden and great fall of temperature on 

 Jan. 30th, continuing over Jan. 31st, caused a decrease in the 

 growth of the leaf. In the other examples, such as No. IV, a 

 small fall in the night temperature, as on March 4th, does not ai 

 all interfere with the maximum growth. From this it appears ti)at 

 a great lowering of the warmth is necessary to seriously arrest 

 progressive growth. 



I am of opinion that the action of direct sun-light, and the 

 direction and torce of the wind, are more potent factors in increasing 

 or arresting growth than small variations of temperature. On this 

 subject I have, at present, no conclusive data. 



The banana is an exceilent subject in which to study given 

 features of physiological development. The growth of its leaves is 

 so rapid that measurements can be recorded twice daily with a 

 measuring rule, and with the possibility of extremely small error. 

 This is of great value in affording light upon the laws and con- 

 ditions affecting the growth of other plants. The Sugar cane, for 

 example, grows so comparatively slowly that with it such obser- 

 vations as I have recorded are not possible. It will probably not 

 be far wrong, however, if the data obtained in observing the 

 banana are applied in judging of the influences which affect the 

 growth of cane and other plants. 



1. April 1896. 



Zwei Ersatzblätter in Linne's Species plantarum ed, 1. 



Von 



Prof. Dr. A. Garcke 



in Barliu. 



In Band LXVI. No. 7/8. p. 216 dieser Zeitschrift wird auf 

 den interessanten Fall aufmerksam gemacht, dass in Linne's 

 Species plantarum ed. 1 das Blatt mit den Seiten 89 und 90 in 

 dm meisten Exemplaren nachträglich angeklebt ist, nachdem das 

 ursprüngliche Blatt durch den Buchbinder cassirt worden war. 

 Zugleich hebt der Verfasser jenes Artikels hervor, dass er ein 

 Exemplar mit dem ursprünglichen Texte besitze und so in der Lage 

 sei, den Wortlaut des zur Vernichtung bestimmten Blattes abdrucken 

 lassen zu können, ausserdem zeichne sich dieses Exemplar noch 

 durch die Eigenthümlichkeit aus, dass die Seiten 269 und 270 



