123 . 
Again, the variation in the stock independent of the grain is shown 
by the measurements of the dimensions of the heads and stocks as 
given in the following tables: 
OATS (FITTBOGEN’S EXPERIMENTS). 
aa J 
Mois- Number Length | Dias: 
ture. of SSDS) of heads. Kenda. 
Per cent. > | mm. | mm. 
80-60 | 8 | ° 555 3.9 
60-40 3P| 4 ae 4.1 
40-30 | 4 | 450 3.6 
30-20 | 2 | 250 3.3 
20-10 4 136 1.4 
SUMMER WHEAT (HABERLANDT’S EXPERIMENTS). 
| A Height of stalks | 
oe (| 
| Number of stalks. bearing heads. 
| Water "Senet | 
. 4 Not | 
Bearing jearing Shortest.) Longest. 
heads. | ‘heads. | 
| em, em, 
24, 800 | 18 12 | 70 95 
14,400 | 12 | 13 | 30 65 
6, 200 5 | 16 | 20 35 
Similar experiments by Sorauer (1873) give results analogous to 
the preceding. He measured the greatest length and width of the 
leaves, at several stages of their growth, of barley plants in tubs of 
different moistures, with the average results for all stages of growth, 
showing that the leaves were longer and broader the more water was 
furnished, while the available nutrition remained the same. 
BARLEY (SORAUER’S EXPERIMENTS). 
| Mois- | Length | Width 
ture. | of leaf. of leaf. | 
Per cent. | mm. | mm. 
60 | 182.2 9.4 
40 166.3 9.1 
20 138.7 6.8 
10 98.7 | 5.6 | 
These and similar observations show that the assimilating organism 
of the plant (viz, its leaves), as also its organism for absorbing nutri- 
tion (viz, its roots), both alike increase with the increase in avail- 
able moisture near the roots in the earth, at least within the limits 
existing in these experiments, and to the same extent is the develop- 
ment of the plant favorable to the increase of its productivity. 
