Related Clues:

• I'm up in the box in the lab
• Manchester merchant
• One who might get a reaction
• He needs a regular supply of drugs to keep going
• Is writer's journal missing one about doctor's source of medication?
• Boots, perhaps, given red film
• 'Church Times', unusual source of drugs
• Scientist put note in crate
• Medicinal preparation here consisting of log stuffed with sulphur compounds
• Dispenser of prescribed medicines
• Place where medicines are supplied
• Medicine dispenser
• Chemist, having supplied sulphur, writes in log-book
• Pharmacist? I'm up to fill medicine-box
• Chemist writes on sulphur in log book