66 
tension of the boundaries of knowledge — the plant 
world may be carried on properly only w a library is at 
hand, which contains all of the more ee ae bearing 
upon the subject. Furthermore, the results of such researches 
should be brought out in periodicals, devoted exclusively to this 
purpose ; a practice followed by all of the more important botan- 
ical srieeeut ons of the 
The principal ies . our Garden have already been de- 
scribed i in previous numbers of this Journat. The laboratories 
s 
the museum building. The rooms on the third floor face to the 
north and west, and open into a hallway on the south, from 
which they receive borrowed light, with the exception of the 
t two named also face the south and east. en- 
tion as already been made of the taxonomic laboratory, and of 
the laboratory of the Director-in-chief in an article dealing with 
the herbarium See : this JourNAL), and no further description 
of them will be n 
The peeing ibeaens is twenty-five by thirty-six feet, 
opening into the library, hallway and morphological laboratory. 
It has three large windows, while all doors are panelled with 
glass, an arrangement prevailing throughout, and which, with 
the ae light from the hallway, makes it possible to do all 
kinds of work in any part of the room. 
The morphological laboratory is thirty-four feet wide and forty- 
two feet long with six large windows receiving direct light and the 
ane illumination as above. The windows extend to within a 
oot of the ceilings, which are eighteen feet from the floor. Heating 
: accomplished by steam radiators and the ventilation leaves little 
to be desired. Both of the above named laboratories are equipped 
ae a necessary eppaatS and the requisite number of first 
with a selection of high power lenses. 
The physiological dark room opens from the morphological 
laboratory, and is fourteen feet square with double doors and 
independent ventilation, connecting directly with the outside air. 
It is heated indirectly by the walls of the contiguous rooms, and 
