Botany and Zoology. 133 
on ship-board ; which brings to view one of the most important prac- 
tical applications of Mr. Ward’s discovery. 
Sir William Hooker states that **the Wardian cases have been the 
means, in the last fifteen years, of introducing more new and valuable 
plants to our gardens than were imported during the preceding cen- 
tury ; and in the character of Domestic Green Houses, i. e., as a means 
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oor; and on its probable future applications in comparative 
researches in vegetable physiology, and even in the treatment of dis- 
eases. T'o these, as to the other topics of this work, no justice can be 
rendered to our author’s suggestions except by lengthened quotations, 
which the nature of this notice does not admit of. It must suffice to 
Th o read it 
as requiring least care, and as making the 
Prettiest appearance at all seasons. Most of these require little light 5 
although our clear skies afford us this in abundance. So little bitumin- 
i he ino 
to vegetation, here interposes tio obstacle to rearing plants. Quite un 
like England, the principal obstacle to the growth of delicate plants in 
our houses in winter, and in our grounds in summer, comes fi 
dryness of the air. For this, the Ward case affords a perfect remedy ; 
as nothing is easier than to furnish a saturated atmosphere for those 
plants that require it, or to supply and retain the degree gh 
which suits any particular species. 
