326 BOTANICAL GAZETTE [NOVEMBER 
show, is a very important influence. We are unable to see how 
Nott could get results at all dependable without taking this pre- 
caution. He was always studying the effect of two stimuli when 
his results purport to be considering one. 
The seeds used in this work were obtained from VAUGHAN and 
will be mentioned by the trade name used by that dealer. 
Experiments and discussion 
EFFECT OF CONTACT OF COATS 
As has been stated, the contact of coats plays a very important 
part in arch-production, and therefore indirectly upon the lateral 
Fic. 2.—Crop of Hubbard squash grown in spray at 23° C.; coats removed at 
the tip and radicles pointing downward. 
placement of the peg. This effect was tested in two ways: (1) by 
growing seeds upon a clinostat with coats intact and with coats 
removed at tips, and (2) by a similar growth of seeds held between 
cork strips with radicles pointing downward or approximately S0- 
These were kept in a dark chamber and watered with 4 spray 
at 23°C., as described above. There is some variation in differ- 
ent varieties in the response to contact. For example, the pump- 
