40) RELATION OF LIME AND MAGNESIA TO PLANT GROWTH. 
On July 28 there were added to the bottles containing plants still 
living, viz, No. 4, No. 5, and No. 6, 2 ¢. c. of a 14 per cent nutrient 
solution, made up as follows: | 
Per cent. | ; Per cent. 
ATI OMAN hci Ura ie ea SRL EC EM Ole eee pn ety Cometnet uled an) dics 1.25 
GN 0 Hae cs aa 5 RESO, 22a Lee ee etek 0.25 
(NE\ISO) ee ae De | 
On August 13, twenty-seven days from the time the plants had been. 
set in the culture solutions, they had attained a growth as follows: 
pane A Solution. Per cent. | Height. | Roots. 
| Om. Cm. 
Al ACO! 2 oS Ai. eetBel es. Dor ees oe mais te Nee ia aya eee ae | Osan} 19 7 
i UO ae ee | CSCS ues, : 
WCRO.o 2 seks eect Reins Aceh ae hes ee | 0.05 |} 
| 6) | SO ween ene ee eee eee ee eee ee eee eee eee 0.05 |] 17 7 
Wis Oa See a EA Ey i NR a Ce Onda 
The plants in the solutions containing both lime and magnesia were 
of normal appearance and growth. The plant in No. 4, with 0.1 per 
cent of lime and no magnesia, exhibited red spots on the leaves, and 
appeared as though the physiological processes had been interfered with. 
On July 30 another series was started, using the cowpea, sprouted 
as before, and 9 cm. high. To each bottle was added 1 ¢. c. of a nutri- 
ent solution of the composition used in the previous experiment. The 
following table shows the additional nutrients added and the results: 
Results of experiments with cowpeas set July 30. 
July 30. August 4. August 7. | August 13. 
No. of 
Rote.) Solution. Per cent. | Condition. Condition. Condition. 
\(Dead. 
Sih ClnG CASES ae Ieee paca | ets ee ee Growing....| Dying at top..../;Height, 20 em. 
| Roots, 8 em. 
| ase | 
9 | MgO as Mg(NOs3). --.- 0.1 | Growing....| Dying at top....|; Height, 24cm. 
| Roots 7 cm. 
A Healthy. 
‘tp mee a) pS Og)e ---- 0. te \Growing....! Hicalithy sees 4 Height, 18 em. 
|| CaOras\Ca(NOs)ocs--. 0.05 | Roots, 11cm. | 
s | | Healthy. | 
“(|| USO SS MHS) cece oe \Growing. Loo |pElealily, = sears '{ Height, 35 em. 
| CaOvas CaGNOs)\p- ss... Ohi | i X 
|| CaO as Ca(NOs)s | Roots, 10 cm, 
| (Healthy. 
1) MgO as Mg(NOs)z ..-- 0.1 \Growing. ...| Healthy ..:-----|; Height, 28cm. 
|| CaO as Ca(NOs)p. -.--- 0.2 " Fever icetalreere 
13)| MgO as Mg(NOs3)2 ---- 0.1 |\prooping ...| Dying ....---.-- peat. 
|| FeO as FeSQ,....----- 0.02 J |Height, 25 em. 
14 MgO as Mg(NOs)z .--- 0.1 \Growing....| Healthy ........ ee 
il Na,O as NaNO, ......- ye 4) Height, 28cm 
| y ‘ : {Dead. 
| Ils) || ESOVEI INESSOM ec ageaaal OM tGrowines-4 |e Del ectedsmasssee ets, 5 ca 
