2 
tionship of different forms in which the examination of the mi- 
nute structure by means of microscopic methods must be made. 
he ing specimens may be readily used in all kinds of ex- 
perimental work dealing with the relation of plants to the soil, 
climate, water, chemicals, light and electricity, growth, reproduc- 
tion, irritability and other functions carried on by the plant. 
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to great advantage, and in the work of defining the relationships 
and limits of species, genera and families. 
Before beginning an investigation of any botanical subject it is 
of the greatest importance that the worker should familiarize 
himself with its botanical history to learn what other botanists 
may have written concerning it. To this end he must search 
the volumes in the library. Periodicals, books, pamphlets and 
manuscripts must be examined and the extent of known facts 
gotten well in mind. The library of the Garden now contains 
nearly nine thousand and is increasing at the rate of over 
of the subject in which his problem lies, fro om he receives 
only so much he dvice as ma) necessary to enable 
him to carry his to a successful prosecution. S as- 
signed him in the laboratories, microscopes, glassware, reagents, 
etc., placed at his disposal, a: ready earch 
for facts that may come to light in a few we few years 
If the results achieved are of sufficient importance, a suitable de- 
scription of method and more ee ils is prepared 
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same time the student may offer his thesis to a university as 
ee, 
In the development of botany the facilities of the laboratory 
