Grozvth of various Water Pla?its in Culture Solution. 365 
EXPLANATION OF PLATE XVII. 
Illustrating Prof. Bottomley’s paper on the Effect of Organic Matter on the Growth of various 
Water Plants in Culture Solution. 
Fig. 1. Lemna major. Contents of dish No. 2 (Table II), after four weeks’ growth. Product 
of 10 plants. About \ natural size. 
Fig. 2. Lemna major. Contents of dish No. 6 (Table II), after four weeks’ growth. Product 
of 10 plants. About | natural size. 
Fig. 3. Salvinia natans. Ten dishes (Table III), photographed after eleven weeks’ growth. 
Upper five dishes contained mineral nutrients only, lower five contained same mineral nutrients 
+ 184 parts per million of organic matter. Ten leaves originally placed in each dish. About 
■1- natural size. 
Fig. 4. Salvinia natans. One dish from each of the two groups above, upper dish containing 
mineral nutrients only, lower one containing mineral nutrients + organic matter. About £ natural 
size. 
Fig. 5. Azolla filiculoides. Contents of dish No. 3 (Table VI), after twelve weeks’ growth. 
One thirty-second part of product of 80 shoots. About £ natural size. 
Fig. 6. Azolla jilicidoides. Contents of dish No. 10 (Table VI), after twelve weeks’ growth. 
One thirty-second part of product of 80 shoots. About £ natural size. 
Bb'i 
