‘ 
Rese 
278 BOTANICAL GAZETTE. [ Oct., 
so that the upper part may be lifted off and the lower half used by itself. A 
cover like that of an ordinary tin pail is used. A. perforated false bottom 
(readily removable) is fitted on suitable supports one and a half inches from 
bottom. When in use this space is to be filled with water. This vessel may be 
made of tin, but copper is better. Over the outer surface thick felt (to be ob- 
tained at thesaddler’s) may be sewed by bringing the ends snugly together after 
placing the piece around each cylindrical portion of the vessel. The felt on 
the cover may be held in place by three or four little “tongues” soldered to 
the upper surface, passed throngh the felt and bent down. To protect the felt 
from the flame a band of tin two and a half inches wide should’ be fastened 
around and allowed to project a half inch below the bottom, the lower edge be- 
ing turned in and up against the vessel. 
I can not help but feel that the sterilizer is much simpler than this descrip- 
tion. The figure may help to a comprehension of the lattes. If tin is used the 
cost need not be over one dollar and a half, and a dollar more for copper. 
The incubator (fig. 2) ought to be made of zinc or copper, preferably the lat- 
ter. The cheapest (though not the best) form is cylindrical with circular cover- 
The bottom and side walls must be double so as to leave a three-fourths inch 
water space. The side walls are closed at the top. Two half-inch holes are to 
be cut through the outer vessel, one at the extreme top vertically over the other 
near the bottom. At this place a vertical nose-piece three-fourths of an inch 
in diameter extends the entire height of the vessel covering the holes just men- 
tioned. This is for filling the water space, and for the insertion of a thermom- 
eter or gas regulator, as well as to indicate the height of the water within. The 
cover may be single tin covered with felt, or better (in service, but more incon- 
venient to handle), of copper, and double for water. In the latter case a side 
projection containing water connected with that inside will be necessary for 
eating by a special lamp. An inch hole fitted with an upright collar is to be 
provided in the cover for the insertion of a thermometer. With the double 
cover a second hole leading to the enclosed water is desirable for a second ther- 
_ Moist growing chambers can be satisfactorily secured by the use of a smal! 
plate or saucer and the largest goblets or tumblers procurable. A simple circle ~ 
made of a strip of zinc an inch wide will serve as a support for the glass cul- 
~ ture plate. ‘The rare can be cut from good window glass the size of the moist 
er, Or 
