ication.

The result of experiment shows that the presence of certain compounds
is essential to the vigor and development of all plants and particular
compounds to the development of certain plants. Plant chemistry and
morphology are related. Future investigations will demonstrate this
relation.

In general terms, we may say that amides and carbohydrates are
utilized in the manufacture of proteids. Organic acids cause a
turgescence of cells. Glucosides may be a form of reserve food
material.

Resins and waxes may serve only as protection to the surfaces of
plants; coloring matters, as screens to shut off or admit certain of
the sun's rays; but we are still far from penetrating the mystery of
life.

A simple plant does what animals more highly endowed cannot do. From
simplest substances they manufacture the most complex. We owe our
existence to plants, as they do theirs to the air and soil.

The elements carbon, oxygen, hydrogen, and nitrogen pass through a
cycle of changes from simple inorganic substances to the complex
compounds of the living cell. Upon the decomposition of these bodies
the elements return to their original state. During this transition
those properties of protoplasm which were mentioned at the beginning,
in turn, follow their path. From germination to death this course
appears like a crescent, the other half of the circle closed from
view. Where chemistry begins and ends it is difficult to say.--_Jour.
Fr. Inst._

[Footnote 1: A lecture delivered before the Franklin Institute,
January 24, 1887.]

[Footnote 2: Studien uber das Protoplasm, 1881.]

[Footnote 3: Vines, p. 1. Rostafinski: Mem. de la Soc. des Sc.
Nat. de Cherbourg, 1875. Strasburger: Zeitschr., xii, 1878.]

[Footnote 4: Botany: Prantl and Vines. London, 1886, p. 110.]

[Footnote 5: For the literature of starch, see p. 115, Die
Pflanzenstoffe, von Hilger and Husemann.]

[Footnote 6: Kutzing: Arch. Pharm., xli, 38. Kraus and Millardet:
Bul. Soc. Sciences Nat., Strasbourg, 1868, 22. Sorby: Jour. Lin.
Soc., xv, 34. J. Reinke: Jahrb. Wissenscht. Botan., x, B. 399.
Phipson: Phar. Jour. Trans., clxii, 479.]

[Footnote 7: Prantl and Vines, p. 111.]

[Footnote 8: L. Crie: Compt. Rend., lxxxviii, 759 and 985. J. De
Seynes, 820, 1043.]

[Footnote 9: Page 279.]

[Footnote 10: M. Nencki and F. Schaffer. N. Sieher: Jour. Pract.
Chem., 23, 412.]

[Footnote 11: E. Klein: Quar. Jour. Micros. Scien