566 
ASTRONOMY: CAMPBELL AND MOORE 
TABLE 5 
Results after CO2 was expelled 
Control (screen not touching the distilled water) Water Ph+ 7 . 6 
Control (screen not touching the distilled water) Water Ph+ 7.6 
Pan with seedlings (screen or seed not touching the distilled water) Water Ph+ 8.0 
Pan with seedlings (screen or seed not touching the. distilled water) Water Ph+ 8.0 
Pan with seedlings (screen and seed touching the distilled water) Water Ph-|- 8.3 
Pan with seedhngs (screen and seed touching the distilled water) Water Ph+ 8.2 
The experiments with corn seedlings indicate that no acid other than 
CO2 were excreted by the roots. The data for corn seedhngs shows an 
exceedingly small increase in the alkalinity of the distilled water when 
the roots were permitted to decompose in the water. The increase in 
alkalinity of the one culture, of 65 seedlings of corn in quartz at the 
end of 7 days, probably indicates the presence of some dead cells that 
were not apparent. Distilled water, into which only the roots of wheat 
seedlings extended, showed a very sHght increase in alkalinity when the 
roots had decayed, but when the screen, germinated and ungerminated 
seeds, and roots were in the water, the increase in alkahnity was slightly 
greater. 
^ Czapek, F., Biochemie der Pflanzen, 2, 872, 1905. 
2 T. Pfeiffer u. E. Blanck, Landw. Versuchstat, Berlin, 77, 217 (1912). 
3 Kunze, G., Jahrb. wiss. Bot., 42, 357 (1906). 
^ Czapek, F., Zur Lehre von den Wurzelausscheidungen, Ibid., 29, 321. 
5 Stocklasa, J., and Ernest, A., Ibid., 46, 73 (1908). 
« Breazeale, J. F., and LeClerc, J. A., Bull. U. S. Dept. Agric. Div. Chem., No. 149 (1912). 
See also Meurer, R., Jahrb. wiss. Bot., ^6, 503 (1909), and Johnson, H. V., Amer. J. Bot., 
2, 250 (1915). 
" The water was distilled from a glass still (which had been used for some months) with- 
out the use of cork or rubber. The first and last parts of the distillate were discarded, 
8 This method was adopted becaus© the indicator must be accurately calibrated by- 
buffer solutions in order to obtain results of any value. Phenolsulphonephthalein is very 
useful for such investigations. 
SPECTROGRAPHIC OBSERVATIONS OF RELATIVE MOTIONS 
IN THE PLANETARY NEBULAE 
By W. W. Campbell and J. H. Moore 
LICK OBSERVATORY. UNIVERSITY OF CALIFORNIA 
Received by the Academy, September 6, 1916 
In these Proceedings, 2, 129 (1916), we described cert in rotation 
phenomena of the planetary nebula N. G. C. 7009 (R. A. = 20 h. 58 m.), 
as observed by means of the Mills spectrograph attached to the 
36-inch refracting telescope. In the past nine months, as opportunity 
offered, we have extended this line of investigation to others of the 
