Letter from Erasmus Darwin to an unnamed patient

Darwin recommends continuing the dose of one grain of opium at night for asthma and suggests the use of the 'new airs' in her treatment. He will teach her how to procure and manage 'oxygen-air'. Darwin also discusses plants he has sent and recommends books on botanical classification. The correspondent is believed to be Miss S. Lea, Shrubbery, Kidderminster.