476 Philippine Journal of Science 1920 
portion of the solution that lies closely adjacent to the root 
surfaces. These partial concentrations should of course be main- 
tained constant in experiments of this kind, but the large 
TABLE 3.—Summary of the experimental series, showing dates, solution type, 
and total molecular concentration (also estimated osmotic value as a 
fraction of an atmosphere of pressure) for each series. 
Date (1918). Total concentration. ® 
8-salt type I. 4-salt type A. 4-salt type B. 
Series. 
Beginning. Ending. Gram- | Gram- |atmos-|_Gt2™-_| atmos- 
molecule phere. /molerale phere, | moleeule| “phere. 
1._..| March 21 | April ll 0. 002 CCH iy) Meaeeieernets panel norehy memmamp sec free 
2....| March 21) April ll 
3..2.| March 24| April ul siobigas  bebeall wusecoemed SAUNAS mania 557 
4_.__.| February 22 | March 14 
5.--.| March 21 April 1 | 0006-1: 0:08 (ine ht ed cee ee 
6_...| March 24 | April 11 
7_---| March 21) April li 
8....| March 24) April uu aspen ihe vad eramenmaien Unter ked saga 2! 
9....| March 21 | April 40>} 0.0245. | 106965). ce feccsam Het Sette eee 
106 __| March 11 | April 5 | 0.0002 O.0b an aes ae eee 
A 2 aE fee SSE aay CAS) Sear teagan ena O20018 O06 ee ee 
Bae oS Bee ES Bad RNS ele yeu eee ODO0G! | 00; 28 tos eh est Se ance eres 
Ra ES Serene cen yeas Sees ae See ee 0.0198)! 0: 00 bce ot cee 2 
14.___) June 19 | July Be ee 0. 0008 ti | ol pieces pees 
15___.| May 24! June 14 
16_...| June 19 | July 9 sx capa aera! -prip et daca 0.0016 0.08 |...-------|---- 
17_...| May 1 | May 22 
18_...| May 24 | June 14 | ee 0.0088. | 0-20 | 3 | a 
19__..| June 19 | July 9 
20....| June 19 | July a5 OR eee Soe 0.007! i. 0.40 (2 Vee 
21..... May 24 | June pe Ni sien ere eter 0.0192 | 1.00 |... 2 ]--e-----4 
22....| May 1| May fl CREAT SRE 0.08841 °° 2:00 | cs 
23.__.; August 3 | August 23 
24....| September 9| September 29 cirertae as Ca i 48 Pe eae oo 9.0008 | 0.04 
25-.--| August 8 | August ti Ge ee ee ieee ecu | ee 
26....| September 9] September 29 | Nene 
27.._.| August 3 | August weet: Saad aerated Eeioteen 0.0038 | 0.20 
28....| September 9] September 29 ‘ kes ey SMa 
= 2d eee: 
. .. i as 
* Total fraction of a gram-molecule of all salts per liter, and estimated osmotic value 
a fraction of an atmosphere of pressure. sod by 
> Series 10, 11, 12, and 13 were with wheat, for comparison with the results obtaine 
Shive. 
amounts of solutions needed and the work involved to accom- 
Plish this made it seem undesirable to attempt the use of con- 
tinuously renewed solutions ** in these preliminary studies; when 
* Trelease, S. F., and Free, E. E., The effect of renewal of gue 
solutions on the growth of the young wheat plants in water-cultures, Jo 
Hopkins Univ. Cir. (March, 1917) 425 and 426. 
ees 
