![](https://coimages.sciencemuseumgroup.org.uk/6/934/large_thumbnail_1996_0312__0001_.jpg)
Specimen of compound derived from the constituents of natural substances belonging to F. B. Power
![SMG00279583](https://coimages.sciencemuseumgroup.org.uk/508/575/medium_smg00279583.jpg)
Specimens of compound derived from the constituents of natural substances, belonging to Dr. F. B. Power (Frederick Belding Power, 1853-1927), USA, 1900-1930. Noted to contain suspected traces of acid.