406 nic yp BOTANICAL GAZETTE [ DECEMBER 
3. KCl and K,HPO, replaced by equivalent quantities of NaCl and 
Stem } turgor Sem ee 2.54 
2% i st ais 7 1.5% 
4. CaSO, instead of Ca(NO3)>. 
Stem | torgor el 5 ee 
Root | argor a ei 2 
The substitution of CaSO, for its molecular equivalent 
Ca(NO,), involves a slight reduction of the osmotic power of 
the solution. This, taken alone, would tend to lower the turgor 
(Stange), but it was unable to make itself felt in the result, for 
the turgor of these stems (4) was the highest in any solution at 
the close of the experiment. 
Sinapis alba. Seedlings were placed in solution, such as 
were used for Phaseolus, December g. This plant is not adapted 
to water culture, and the specimems were never vigorous, though 
none of them in 1 or 3 died during the experiment. 
1. Normal. 
Dec. 2x Jan. 23 Feb. 8 
length aa $5 ” ioe 
— ; turgor 3% 34 44 
2. Distilled H,O. 
length a dead 
Stem | turgor ot 
: 3. Na instead of K. ‘ 
Stem ) length 5" ee a 
ie } turgor 2% 2.5% 3% 
The roots were stunted from the start, and the unusual 
height of the turgor of the stems may have been due to the 
_accumulation of food, at least in part. But starch was present 
in 3, as well as in 1,so that their difference in turgor (1 pet 
cent. at, the close of the experiment) must be referred to the 
effect of the presence or absence of K, for a reasonably definite 
a ee 
