4 



BULLETIN 306, U. S. DEPARTMENT OF AGRICULTURE. 



bloom; the third on June 21, when the first berries were developing; 

 and the fourth on September 8, when most of the berries were ripe 

 and much new growth had appeared in the form of shoots and suckers. 

 The season was a very unfavorable one, and the plants made a rather 

 small growth, so that during July and August the leaves were too 

 small and sparse to secure samples. For the purpose of comparison, 

 Table III gives the alkaloidal content of the various samples and the 

 average for the season, the average alkaloidal content of each picking 

 being summarized at the close. 



TAble III. — Alkaloids in the leaves of individual first-generation belladonna plants at 

 various stages of growth at Arlington, Va., during the second season, 1913. 





Alkaloidal content (per cer 



t). 





Alkaloidal content (per cent). 



Plant 













Plant 













No. 



First 



Second 



Third 



Fourth 



Aver- 



No. F 



irst 



Second 



Third 



Fourth 



Aver- 





stage, 



stage, 



stage, 



stage, 



age for 



st 



a#e, 



stage, 



stage, 



stage. 



age for 





May 5. 



May 23. 



June 21. 



Sept. 8. 



season. 



Me 



ly b. 



May 23. 



.Tune 21. 



Sept. 8. 



season. 



34i 





0.316 



0.324 





0.320 



12 6 



809 



0.601 



0.625 



0.716 



0.688 



34z 



0.516 



.473 



.312 



0.856 



.539 



12 7 



750 



.608 



.582 



.574 



.529 



34 3 



.608 





.352 



.863 



.604 



12 8 



587 



.434 



.569 



.653 



.561 



344 



.754 

 .622 



.434 

 .542 



.288 

 .356 



.683 



.492 

 .551 



12g --- 







.389 



.549 



.469 



34 5 













.53S 



.366 



.430 



.523 



.466 



7wi . . . 







.626 

 .507 



.737 

 .759 



.681 



3i 



7w 2 



835 



.550 



.663 



3 2 



.565 



.565 



.630 





.587 



7w 3 



620 



.563 



.431 



.782 



.599 



3s 



.511 



.552 



.364 



.790 



.554 



7w 4 



792 



.777 



.588 



.804 



.740 



34 



.693 



.607 



.350 



.833 



.621 



7w 5 ... 





.521 



.699 



.998 



.739 



3 5 



.513 



.477 



.533 



.767 



.573 



7w 6 



674 



.721 



.567 



.663 



.656 



3 6 



.438 





.392 





.415 



7w 7 



369 



.765 



.760 





.631 



37 



.412 



.415 



.504 





.444 



7ws . . . 





.291 





.645 



.468 



3s 





.300 

 .479 







.300 

 .654 



7Wg 



7wio 



714 

 634 



.389 

 .496 



.544 

 .489 



.764 



.412 



3 9 



.702 



.782 



.596 















7wn ... 





.404 



.626 



.773 



.601 



13i 





.255 



.459 



.934 



.549 















13 2 





.365 



.596 





.481 



6wi 



541 



.543 



.501 



.666 



.561 



13 3 







.453 

 .318 



.649 



.453 

 .455 



6W2 



6w 3 



850 



.693 

 .641 



.881 

 .787 



.885 



.787 



13 4 



.492 



.359 



.791 



13s 





.466 



.559 



.563 



.529 



6W4 



866 



.516 



.529 



.856 



.692 



13 6 







.470 

 .552 



.733 

 .766 



.601 

 .553 



6w 5 

 6w 6 



806 

 780 



.640 

 .735 



.768 

 .663 



.829 

 .733 



.761 



13 7 





.34i 



.728 



13s 





.349 



.664 



.792 



.601 



6w 7 



739 



.917 



1.313 



.956 



.981 



13 9 



.566 



.452 



.385 



.815 



.555 



6W8 



780 



.921 



.937 



1.020 



.915 















6W9 



833 



.921 



.901 



.919 



.894 



12i 



.854 



.653 



.737 



.494 



.688 



6wio 



908 



.925 



.927 



.876 



.909 



12 2 



.480 



.516 



.661 



.717 



.594 



6wn 



956 



.973 



.993 



.924 



.962 



12 3 



.760 



.672 



.675 



.638 



.686 



6W12 



681 



.574 



.670 



.922 



.712 



12 4 



.605" 



.572 



.626 





.619 



6w i3 1 



143 



.639 



.852 



.754 



.847 



12 5 



.588 





.675 



.908 



.543 















Summary of All Individual Plants from Each Parent. 



Parent plant. 



Averag 



s alkaloidal content of leaves (per cent). 





Yield of 

 alkaloids. 



Stage of growth. 



Average 



No. 



First 

 stage. 



Second 



stage. 



Third 



stage. 



Fourth 



stage. 



for 



season. 



34 



Low 



do 



0.625 

 .524 

 .529 

 .679 

 .662 

 .824 



0.441 

 .470 

 .369 

 .573 

 .547 

 .740 



0.326 

 .488 

 .495 

 .617 

 .583 

 .824 



0.800 

 .739 

 .765 

 .662 

 .769 

 .862 



0.501 



3 '.. ...... ." 



.512 



13 



Medium... 



High. 



do 



.531 



12 .......;. ' ....... 



.597 



7w 



.617 



6w ; . . . ; 



do 



.811 









Average 



.640 



.523 



.555 



.766 











