IN Black's “Lectures on the Elements of Chemistry,” published in 1803, there occurs the footnote in reference to marsh gas (spoken of by Black as ‘inflammable air’): “The Dictamnus Fraxinella emits it ... AN arrangement for the distribution of the pollen of Dictamnus Fraxinella, which I noticed last June, may interest some of the botanical readers of NATURE. The plants will shortly be in flower, so ...

Understanding the Context