130 PLANT PHYSIOLOGY 



have recently received comprehensive treatment at the hands of STEINBRINCK 

 (1906). It is all the more important to draw attention to this treatise, as it 

 is due to STEINBRINCK, in the first instance, that the detailed facts have become 

 established. 



418. Lecture XXXIII is XXXII of the 2nd German Edition. 



418, Add to title of lecture SLINGING MOVEMENTS 

 11. 8-10, delete [The branches . . . 1904). 



11. 13-14, for yet to tension . . . water read yet to the cohesion of the 

 evaporating water-content. 



11. 25-6, for the osmotic . . . solution is read the cell membrane is unstretch- 

 able by osmotic pressure we may conclude that a solution which just causes 

 plasmolysis is 



1- 37> for 3'5 read 4-67 



419, 1. 33, after atmospheres, read Still more remarkable are the regulatory 

 phenomena seen in cells cultivated in concentrated media ; while higher 

 plants possess only a very limited power of adapting themselves to higher 

 concentrations of the substratum, Mould Fungi behave totally differently. 

 ESCHENHAGEN (1889) showed that Aspergillus niger, Penicillium glaucum, 

 and Botrytis cinerea were still capable of growing in 51-55 per cent, solutions 

 of common salt. RACIBORSKI (1905) noted growth still taking place in Asper- 

 gillus glaucus in saturated salt solutions and in a species of Torula in con- 

 centrated lithium chloride. Since the osmotic value of the cell-sap must be 

 greater than that of the environment, the pressure in these fungal cells amounts 

 to 300 atmospheres or more. In many cases such pressures must be caused 

 by the entry of the nutrient solution into the cells ; Bacteria and Cyanophyceae 

 especially have very permeable protoplasm. On the other hand, a formation 

 of osmotically active materials often takes place within the cell, but the chemical 

 nature of the substances so produced is as yet doubtful (HEINSIUS, 1901 ; 

 PANTANELLI, 1904 ; RACIBORSKI, 1905). 



I. 40, after up to insert a point within 



II. 45-6, for insoluble . . . (e.g. starch) read insoluble (e.g. starch) or if 

 soluble have large molecules, 



420, 11. 3-4, for elasticity . . . deformation read elastic reaction equals the 

 pressure ; the stretched wall resists now all further deformation more strongly 

 than before, 



11. 37-8, for only in the seeds . . . 1900), read further, the joint cells 

 of hairs of Aristolochia, already alluded to, are very extensible, for they may 

 be increased as much as 30 per cent, in length by osmotic pressure, and may 

 be stretched mechanically a further 30 per cent, without the deformation 

 becoming permanent. 



I. 42, for occurrence read amount 



II. 44-5, for The value ... of that read The value of the original osmotic 

 pressure must have been only half the pressure actually observed. 



11. 54-5, for accompanied by contraction read or of extensibility 



421, 1. 31, after contract read when isolated 



422, 1. 10, for excretion- (bis) read secretion- ; for may read might 



I. 12, before According insert Nevertheless ; delete although 



II. 23-8, for the wall is extended . . . above the normal, read the stretch- 

 ing of the wall is made permanent by growth, and as this progresses osmotic 

 pressure becomes more and more directed against the external resistance. 

 When the tension of the wall has completely disappeared, in the long run the 



