40 



LOUISE DOSDALL 



the greenhouse, or 50% full sunlight. The effect is shown in 

 figure 4, B. At the end of six weeks the plant from the shade tent 

 was 7.4 cm. high and the other 80.0 cm. high. These plants 

 grew in mud. 



Fig. 4. A. Equisetum fluvial He showing effect of varying soil-water contents on 

 growth. Left, submerged; centre, mud; right, 35%. B. Equisetum fluviatile 

 showing effect of varying light intensities on growth. Left, 50%; right, 3%. 



The results show that both water content and light intensity 

 have a marked effect on growth in Equisetum fluviatile. 



(3) Transpiration and water content 



The effect of the three water contents on the amount of tran- 

 spiration was determined for Equisetum fluviatile. To check the 



