See:
Thanks Henry, I’ll get this one and look forward to reading what roses they used and to what extent sulfuric acid aided germination. There are past articles on sulphuric acid treatment of roses by Jackson and others and if I remember right some found it not to help and others found it mildly helpful. It’ll be good to compare what they did with the others (types of roses, exposures, seed handling before and after treatment…) to try to understand what is happening.
Sincerely,
David