[24]. Since this observation, Mr. Huggins discovered that two small comets give an analogous spectrum.
[25]. From further observations Mr. Huggins is of opinion that the red colour of this planet is not due to its atmosphere, but is peculiar to certain parts of its surface.
[26]. ‘Quarterly Journal of Science,’ April 1864.
[27]. Jan. 7, 1865.
[28]. On the latest discoveries concerning the sun’s surface, by Balfour Stewart, Esq., in the ‘Chemical News and Journal of Physical Science’ of April 1865.
[29]. According to Payen. Like starch, it is stained blue by iodine.
[30]. ‘On the Functions of the Nitrogenous Matter of Plants.’ By M. L. Garreau, ‘Annales des Sciences naturelles,’ t. xiii. 1860.
[31]. ‘Remarks on the Vessels of the Latex, the Vasa Propria, and the Receptacles of the elaborated Juices of Plants.’ By M. Lestiboudois, ‘Comptes rendus,’ 1863.
[32]. The author is indebted throughout many parts of this section to the excellent work of Dr. Carpenter, and to the ‘Cryptogamic Botany’ of the Rev. M. J. Berkeley, from which also many of the cuts are derived.
[33]. Mr. Berkeley’s ‘Cryptogamic Botany.’