648 The Philippine Journal of Science 1922 
Solutions changed, August 13, 20, and 25, and September 3, 10, and 
19, 1917, 
Harvested, September 22, 1917. 
TABLE 12.—Lengths of tops and roots and the number of leaves of the 
plants at the time of harvest. 
Te 
Humid. Dry. 
turin cami | Taber |x| Conan tees 
| Lengt! engt ength engt. : 
of top. | of roots. Leaves. of top. | of roots. Leaves. 
cm. cm. cm. em, 
Pessoa eA oe Sk 6.0. 27.0 il 5.0 26.9 il 
Ware hee eae 6.0 18.5 il 5.5 26.0 8 
a Gti aap awaits Games ceo 6.4 19.0 10 5.0 35.1 ll 
We eaieatei eet Sew Laer. ge et Soe 5.5 23.0 9 5.0 19.0 ll 
Pe OmGvoI ye ee 7.5 25.0 12 4.5 29.5 12 
og TOE EE SRS So ea nen Seep ae ae | 5.7 28.7 10 5.0 28.5 10 
BV | 6.2 28.5 10.5 5.0 27.5| 10.5 
In order to get an idea of the effect of the difference in 
humidity in the two culture chambers upon the relative rates 
of transpiration of the plants, the amount of water transpired 
by the individual plants for four consecutive weeks was deter- 
mined by weighing plants and containers at intervals during a 
part of the time of the experiment. It should be stated that 
precautions were taken to prevent as much as possible the loss 
of water through other processes than transpiration or evapora- 
tion from the plants. Table 13 gives the results. 
TABLE 13.—Water transpired. from August 25 to September 22. 
Plant No. Humid. Dry. 
RX g. g. 
oes eek a a aoa Soa en 153.6 | 228.0 
Meivuauian sa, se eee 144.0} 220.0 
obah agentes a Seto eos Sou weak ee i eS 189.0} 208.0 
Pena fais (ste eS Tia s. ecans ee eet tal So cee 182.4 | 209.6 
RE SASS Soba ae a cages wen ge gt 142.0| 218.0 
Drier oe es Ae ee Ae ere 154.0 | 263.6 
VOONRO Teo ee 144.2 | 224.5 
Tables 14 and 15 contain the results of the dry weight and 
ash determinations. 
The data on the amount of water transpired for four weeks, 
the weight of total dry matter, and the percentages of total ash 
are combined in Table 16. In Table 17 are given the amounts 
of dry weight and ash per 100 cubic centimeters of water tran- 
spired. 
