704 MICROSCOPY. 
each natural kingdom may be preceded by a few typical slides 
illustrating, not exhaustively, the material of which it is built. 
In the mineral kingdom, micro-chemicals precede micro-minerals, 
but there seems to be no gradation of minute forms upon which a 
classification could rest. The systems employed in the text-books 
may therefore be followed. Polarizing objects form a convenient 
subsection. Several specimens of the same substance may be 
arranged geographically. There should be no microscopical geol- _ 
ogy, but its subjects should be scattered through the gen 
collection according to their biological relationships. To every 
natural division should be appended a series illustrating its appli- 
cation to the arts and manufactures, showing its utility, purity, 
adulterations, etc. 
In the vegetable kingdom the natural orders should, as far as 
possible, regulate the general arrangement, while the subsidiary 
divisions should be of a physiological character. Often the lower 
organisms can be viewed in ‘their completeness in a single slide, 
while the higher can only be illustrated by a succession of sub- 
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series. The lower forms, almost up to the ferns, should be prima- . 
rily grouped according to their genetic affinities, the subdivisions . 
being physiological. The higher forms, however, monocotyledons 
and dicotyledons, should be primarily divided physiologically ’ 
according to organs and apparatus, the secondary divisions being 
dependent on genera, families, etc. Thus the roots, stems, flowers, 
ete., must be grouped together and not separated that each genus 
may be separately illustrated. Fossil forms should be placed with 
the rest. Specimens of unknown affinities may 
logically, geographically or according to t 
Teratology should follow physiology. Fabrics, adulterations, se 
should conclude the series. 
general 
The animal kingdom should be arranged on the same 
principles as the vegetable kingdom. 
The cabinets for the retention of objects are be 
and in a cubical form so that any number of them may be de 
up to form a large cabinet. The slides should lie flat sig Nene k 
containing but a single layer.. Some of the English opeet 
cabinets of polished deal, which are a cheap and excellent s0 ™ aa 
st made small 
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tute for the elegant mahogany cabinets ordinarily "i ai w 
greater cheapness is required, trays of tin or of pasta plans 
used, piled up in boxes of convenient size according to TE 
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