136 
Journal of Agricultural Research 
Vol. I, No. 2 
In 1912 the same line of observation was followed in connection with 
the same plants and the results are also included in Table II. Unfor¬ 
tunately, the disease described elsewhere killed fully one-half of the plants 
by the end of the season. Therefore, the results given in the table are 
not as complete as those of the previous year, especially with regard to 
the fourth and fifth pickings. The stages of growth at which the pickings 
were made correspond closely to those of the previous year, as the dates 
indicate. 
At the drug-testing garden at Bell, Md., where the soil is quite different 
from that at Arlington Experimental Farm, 19 individual plants were 
under observation and three pickings of leaves were made. Owing to a 
delay, no picking was made at the time of the first picking at Arlington, 
although the plants at both places were at the same stage of development. 
Consequently, the picking on May 27, which is designated as the first at 
Bell, corresponds to the second picking of the Arlington plants. Table 
III shows the results. 
Table III .—Description of individual belladonna plants and percentage of alkaloids in 
the leaves of each at different stages of growth , at Bell , Md., in IQII. 
Plant No. 
Description of plant. 
Alkaloids (per cent). 
Number 
of stems. 
Height (inches). 
May 27. 
June 22 . 
First 
picking 
May 27. 
Second 
picking 
June 22. 
Third 
picking 
Oct. 17. 
Average 
for 
season. 
I 
5 
22 
22 
0. 329 
O. 288 
0. 422 
0. 346 
2 
4 
19 
22 
*474 
. 502 
•395 
*457 
3 
8 
20 
24 
■ 485 
. 408 
. 64I 
• 5 ii 
4 
4 
23 
26 
• 639 
.686 
• 57 ° 
* 632 
5 
3 
24 
24 
• 659 
■ 637 
.415 
• 57° 
6 
2 
25 
24 
•577 
■ 637 
• 559 
. 624 
7 
4 
23 
24 
• 654 
. 722 
. 482 
. 619 
8 
3 
25 
24 
.467 
.464 
. 466 
9 
3 
24 
26 
. 526 
• 59 S 
• 350 
•477 
10 
6 
23 
26 
• 75 2 
. 600 
. 418 
• 590 
11 
4 
15 
18 
* 571 
•485 
• 579 
• 545 
12 
5 
26 
28 
■ 548 
.424 
.486 
13 
5 
22 
24 
•695 
•587 
• 75 ° 
.677 
14 
5 
27 
30 
.407 
• 605 
. 506 
i 5 
3 
l6 
18 
• 43 *> 
■ 448 
.442 
16 
5 
30 
28 
. 466 
•390 
• 511 
* 456 
U 
7 
28 
30 
.823 
.665 
• 527 
• 675 
18 
6 
33 
34 
• 754 
. 689 
* S° 2 
.648 
19 
6 
24 
22 
. 782 
•783 
• 556 
• 707 
