64 BOTANICAL GAZETTE [yuLy 
only slightly stronger than that in C, the tissues which are placed in C 
are not injured. In cases where extraordinary care is needed, it may be 
desirable to keep the tissues some distance from the opening through 
which the alcohol enters C. The siphon y removes the excess of 
Fics. 1-3.—Fig. 1, A, supply bottle; B, mixing tube; C 
dehydrating tube; », waste tube; ¢, ¢, capillary tubes (air vents); 
u, supply tube; 2, “capillary”; x, overflow; y, siphon; z, tube 
for starting siphon; fig. 2, “Capillary” on a larger scale: n, large 
tube; m, smaller tube, aioe to capillary (f) and sealed into Fic. 3 
lower end of ; fig. 3, washing jar with gauze neck. 
dilute alcohol from C. The bent end of the siphon in the waste tube 
D prevents the automatic emptying of the siphon. When the appara- 
tus is to be used, tissues and water are placed in C, and an equal volume 
of water is placed in B. The overflow x and the siphon y, which is 
filled by withdrawing the air from D through the tube z, are set to 
keep these volumes constant. The flow of alcohol is started by remov- 
