MERCURIC CHLORIDE ON MAIZE. 197 



The experiments were then continued as follows : 



(2) U. S. p. B. No. 120 (field corn): 



Checks, 20 19, 20, 20, 20; Checks, 20, 18, 19, 18, 20; 



Mercuric chloride (40 minutes), 18, 18, 13, 18, 15; Mercuric chloride (50 minutes), 16, 18, 16, 18, 15. 



The most injury (retardation) was in seeds exposed 40 and 50 minutes. A few were 

 just coming up on the sixth day. 



(3) Yellow Dent. — Examined at the end of seven days: 



Checks, 20, 20, 20, 20, 20, Checks, 20, 20, 20, 20, 20; 



Mercuric chloride (20 minutes), 20, 20, 20, 20, 20. Mercuric chloride (40 minutes), 19, 20, 20, 20, 20. 



Checks, 20, 20, 20, 20, 20; Checks, 20, 20, 20, 20, 20; 



Mercuric chloride (30 minutes) 20, 20, 20, 20, 20. Mercuric chloride (50 minutes), 20, 20, 20, 20, 20. 



Considerable retardation at first, especially in longer exposures. Scarcely any in the 

 20 minute exposure at end of experiment, and all making a good growth. 



(4) White Flint. — Examined at the end of eight days: 



Checks, 20, 20, 20, 20, 20; Checks, 19, 20, 20, 20, 20; 



Mercuric chloride (20 minutes), 20, 20, 20, 20, 20. Mercuric chloride (40 minutes), 20, 20, 20, 20, 19. 



Checks, 20, 20, 20, 19, 20; Checks, 19, 20, 20, 20, 19; 



Mercuric chloride (30 minutes), 19, 20, 19, 20, 20. Mercuric chloride, (50 minutes) 19, 20, 19, 20, 20, 



Considerable retardation at first, especially in longer exposures. Scarcely any in the 

 20 minute exposure at end of experiment, and all making a good growth, even the plants 

 from seed exposed for 50 minutes. 



(5) Black Mexican, examined at the end of 7 days: 



Checks, 19, 17, 19, 18, 18. Checks, 20, i8, 15, 20, 16. 



Mercuric chloride (20 minutes), 16, 18, 18, 19, 17. Mercuric chloride (40 minutes), 19, 19, 18, 18. 



Checks, 17, 17, 19, 20, 19, Checks, 16, 18, 18, 15, 19. 



Mercuric chloride (30 minutes), 19, 16, 19, 19, 17. Mercuric chloride (50 minutes), 19, 18, 17, 18, 18. 



(6) Early Evergreen, examined at the end of 8 days: 



Checks, 18, 18, 19, 19, 20. Checks, 19, 19, 18, 20, 20, 



Mercuric chloride (20 minutes), 18, 19, 18, 20, 19. Mercuric chloride (40 minutes), 18, 19, 19, 18, 17. 



Checks, 17, 20, 20, 18, 20. Checks, 20, 19, 18, 19, 18. 



Mercuric chloride (30 minutes), 18, 19, 17, 19, 19. Mercuric chloride (50 minutes), 20, 19, 20, 16, 18. 



(7) Country Gentleman, examined at the end of 8 days: 



Checks, 19, 19, 18, 19, 18. Checks, 20, 18, 20, 19, 19. 



Mercuric chloride (20 minutes), 19, 20, 19, 19, 19. Mercuric chloride (40 minutes), 20, 20, 20, 18, 20. 



Checks, 16, 18, 19, 18, 20. Checks, 19, 20, 18, 19, 20. 



Mercuric chloride (30 minutes), 20, 20, 19, 19, 18. Mercuric chloride (50 minutes), 20, 18, 19, 17, 20. 



The retardation was about the same in 5, 6, and 7. It was most in those exposed for 

 the longest periods. There was no serious injury in any. All made good plants. 



(8) Old Colony, examined at the end of 7 days : 



Checks, 19, 19, 18, 19, 20. Checks, 18, 19, 19, 19, 19. 



Mercuric chloride (20 minutes), 20, 19, 19, 20, 19. Mercuric chloride (40 minutes), 18, 20, 19, 18, 19. 



Checks, 20, 18, 20, 17, 19. Checks, 17, 17, 17, 20, 19. 



Mercuric chloride (30 minutes), 17, 19, 17, 17, 20. Mercuric chloride (50 minutes), 18, 16, 18, 17, 19. 



(9) Country Gentleman (another source), examined at the end of 7 days: 



Checks, 19, 19, 18, 19, 19. Checks, 20, 18, 19, 19, 17. 



Mercuric chloride (20 minutes), 20, 19, 19, 18, 20. Mercuric chloride (40 minutes), 16, 16, i8, 20, i8. 



Checks, 18, 20, 19, 19, 20. Checks, 20, 20, 18, 19, 19. 



Mercuric chloride (30 minutes), 19, 18, 20, 19, 19. Mercuric chloride (50 minutes), 19, 18, 15, 20, 18. 



Plain retardation in treated seeds of 8 and 9, expecially the longer exposures, but all 

 growing well when removed. 



(10) Golden Bantam, examined at the end of 7 days : 



Checks, 15, 15. 13. 13. 16. Checks, 17, 16, 15, 8, 14. 



Mercuric chloride, (20 minutes) 12, 16, 16, 14, 16. Mercuric chloride (40 minutes), i8, 18, 16, 16, 16. 



Checks, 16, 13, 14, 17, 14. Checks, 14, 14, 12, 17, 17. 



Mercuric chloride (30 minutes), 19, 16, 16, 15, 18. Mercuric chloride (50 minutes), 10, 17, 14, 15, 17. 



Very little retardation of this variety in 20, 30, or 40 minutes' exposure. In all cases 

 100 cc. of the I :iooo mercuric chloride water was used for each 100 seeds. 



