etail, he added that the mice were born full-grown. See 'Louis Pasteur:
His Life and Labours.' By his Son-in-law. Translated by Lady Claud
Hamilton. (Longmans, Green, & Co.) P. 89.

[3] He then goes on to relate a number of experiments by Cornelius
Drebel and Albertus Magnus, showing the refreshing power of this balsam,
and then those of Quercitan with roses and other flowers, and his own
with nettles.

[4] Priestley, however, did not realise that _carbonic acid gas_ was a
necessary plant-food; on the contrary, he considered it to have a
deleterious action on plant-growth. Percival was really the first to
point out that carbonic acid gas was a plant-food.

[5] It is recorded as an instance of the scientific enthusiasm of the
man, that he was wont to carry about with him bottles containing oxygen,
which he had obtained from cabbage-leaves, as also coils of iron wire,
with which he could illustrate the brilliant combustion which ensued on
burning the latter in oxygen gas.

[6] For a full account of Senebier's researches, see 'Physiologie
vegetale, contenant une description des organes des plantes, et une
exposition des phenomenes produits par leur organisation, par Jean
Senebier.' (5 tomes. Geneve, 1800.)

[7] How Crops Grow. By Professor S. W. Johnson. Macmillan & Co.
(Introduction, p. 4.)

[8] See p. 40 to 45.

[9] Elements of Agricultural Chemistry, in a course of Lectures for the
Board of Agriculture. By Sir Humphry Davy. (London, 1831.)

[10] This department of agricultural research was subsequently carried
on by Sprengel, Schuebler, and others.

[11] Born in Paris, 1802; died 11th May 1887.

[12] See p. 40.

[13] While much of Boussingault's work was carried out previous to the
year 1840, he continued to enrich agricultural chemistry with numerous
valuable contributions up till the time of his death. It may be well
here to mention the names of his most important contributions to
agricultural science, made subsequent to 1840.

In 1843 he published, in a work entitled 'Economie Rurale,' the results
of his numerous experiments and researches. This work is well known to
English agriculturists from an English translation which appeared in
1845 (Boussingault's 'Rural Economy,' translated by G. Law. H. Balliere,
London).

In 1860 appeared the first volume of his last great work, 'Agronomie
Chimie Agricole et Physiologie' This work, which consisted of seven
volumes, was not finished till 1884. He died on th