2. The interaction of Bh with recessive c has been discussed in a previous corn letter. Since the Bh gene is of more than usual interest an attempt was made to find its position in chromosome 6. The following B. C. data involving Y, Pl, and Bh were obtained:

Y	y	Y	y	Y	y	Y	y
Pl	pl	pl	Pl	Pl	pl	pl	Pl
Bh	bh	bh	Bh	bh	Bh	Bh	bh
163	176	69	83	3	1	0	0

Y‑Pl 30.7% recombination

Pl‑Bh 0.8% "

The most likely order is Y‑Pl‑Bh but owing to the long interval between Y and Pl and the short distance between Pl and Bh some doubt remains if this is the correct sequence. Tests are being made involving the new pg gene mentioned above in this letter. Two point data involving Pl and Bh were also

obtained giving 1.4% recombination in a total of 781. Two point data for Y and Bh are as follows:

Y Bh	y bh	y Bh	y bh
908	412	378	914

Y‑Bh 30.2% recombination.