258 Dr. Dauseny on the Degree of Selection exercised by Plants, with regard 
phate of strontian, indicates how much. is owing to the quantity of earthy 
matter brought to it by the rains. 
The following is a tabular view of the results of the above-mentioned expe- 
riments. 
Portion soluble 
Portion inso- 
In water, |Innitricacid,| luble in these 
menstrua, 
2 Weight of | Weight of its Chinisi f 
Subject of the ie iva; the plant aher when onsisting o 
Experiment. when dried. burnt. 
I com- | Same com- 
ined with bined with : 
carbonic and | carbonic and Shits. 
phosphoric | phosphoric : 
acids. acids, 
Lotus tetrago- 
nolobus, seeds | SS a ae Be MENS 30 5:2 3:4 only a trace. 
780 grs. .... 
Same quantity Ina 
of ditto. Greenhouse. 
— Soir. 
Speen 4002. 60 very small.| 17:15 not estimated, 
Ditto. Carrara marble. 2233 67:5 r8 20:9 not estimated. 
Ditto. - Sea-sand. 1135 34:3 41 6:0 not estimated. 
Ditto. In a Garden. 
Soir. 
Sulphate of x 
URL 4862 94-0 0:72 27-2  |notestimated. 
Ditto. Carrara marble. 3267 64:5 a trace. 98:9 1:5 
Ditto. Sea-sand. 2957 67:0 a trace. 16:0 8:8 
1560 grs. of f | Common gar- : : E 
DES { tecoeh I0) 164-50 33:6 97-70 10-0 
or 
780 grs. In ditto. 5267 82°25 16°8 13°85 5:0 
In 1832 I made similar arrangements to those just alluded to, with the 
addition of a fourth box, containing washed flowers of sulphur, and the omis- 
sion of those which the preceding year had remained in a garden. The four 
boxes employed being placed in a greenhouse under: cover, 300 grains of 
barley were sown in each of them, and they were severally moistened, as they 
seemed to require, with distilled water, containing in every ten gallons two 
