64 
BOYAL HOETICTTLTFIIAL SOCIETY. 
Meport on the Quantity of Vegetable Matter produced. 
By Dr. J. H. Gilbert, F.R.S., F.C.S. 
As has been already explained, there were several circum- 
stances, and notably the richness of the soil, the too thick sow- 
ing of the seed, and the consequent crowding of the plants, 
which prevent the results of this first year's experiments from 
being so conclusive as might be wished on the many points of 
interest connected with tendency and character of development 
which they were calculated to raise. It is perhaps the more 
desirable to follow up the preceding report of the observations 
on the character of development of the various species under 
the influence of the different manures, by records of the actual 
quantity of matter produced in each case. 
It was thought sufficient for the purpose to determine simply the 
total amount of substance cut, and dried at 212° F., and the total 
amount of mineral matter represented by the ash left on burning 
a proportional part. The analytical work has been performed, with 
Mr. Lawes's permission, in the Eothamsted Laboratory. The 
results are given, in summary in Tables I., II. and III., which 
follow, and in full detail in Table IV. 
Table I. — Weight of plant produced (two cuttings) dried a 
212° F. 
I. 
2. 
3. 
4. 
5. 
6. 
Description of plant. 
1 
i 
n 
it> 
'S 
T3 
0 
O! 
mineral 
re and 
lia-salts. 
mineral 
e and ni- 
f soda. 
Order. 
Genus and Species. 
§ 
B 
a 
-ss 
.2 E 
0 
i 
< 
1 
lu c fl 
X e) a 
.ail 
( 
ii. Anthoxanthum odo- 
OZ. 
5'99 
4*36 
976 
6-25 
3'93 
8-04 
oz. 
6'53 
3*46 
n"34 
6*96 
4*09 
oz. 
9'94 
4*59 
i3'54 
8-54 
5-38 
10*03 
oz. 
9*60 
5'44 
15*06 
7*62 
4*34 
10-97 
oz. 
940 
5 "04 
i5'55 
6*98 
5*64 
10-50 
oz. 
9-18 
5*8o 
14*85 
7-56 
4*98 
10*36 
Graminacese ■< 
8*70 
6-39 
7*i8 
867 
8-84 
8-85 
8*79 
Leguminosse J 
viii. Lotus corniculatus 
9 "45 
20*90 
7'34 
"'39 
i8*66 
9*62 
1214 
24*16 
9'47 
12*27 
21*13 
9'57 
10*32 
2371 
10-54 
i2'35 
22*47 
9*22 
12*56 
I 3"22 
15*26 
14'32 
14*86 
14*68 
Plantaginacese 
Compositae 
UmbelliferfB . 
X. Plantago lanceolata ... 
xi. Achillea Millefolium . . . 
26*48 
22*99 
1*59 
2o*o6 
21*97 
2*01 
27-28 
22*73 
2*87 
27*76 
2112 
2*95 
29-83 
21*33 
3-53 
29*15 
20*32 
4*19 
17*02 
14*68 
17*63 
17-28 
18*23 
17*84 
10*59 
10-57 
12-56 
12*32 
12*70 
12-54 
