Received May

Solvents with boiling points below 90-95°. A steam bath or water bath should be employed. Alternatively, the apparatus of Fig. 77,13, 3, but with a Alter flask as receiver, may be used the end of the rubber tubing attached to the tubulure is either placed in the sink or allowed to hang over the bench. If a distillation is ultimately to be conducted in the flask from which the solvent is removed, the apparatus depicted in Fig. 77,13, 4 is recommended the distilling flask may be replaced by a Claisen flask or a Claisen flask with fractionating side arm, particularly if the subsequent distillation is to be conducted under diminished pressure. 

Receivers are commonly made of steel tuhe with welded dished ends, and are located horizontally. Small receivers may he vertical, for convenience of location. The liquid drain pipe from the condenser to the receiver should he amply sized, and any horizontal runs sloped to promote easy drainage. Shut-off valves in this line should not he in a horizontal outlet from the condenser, since their slight frictional resistance will cause liquid hack-up in the condenser. Oudet pipes from the receiver may he from the bottom or, by means of an internal standpipe, may leave at the top. A valve is invariably fitted at this point. 

Ammonia receivers may have an oil drum pot, and the receiver will slope slightly down towards this. 

Received May 13, 1965, G. M. Happ was supported by a National Institutes of Health Postdoctoral Fellowship (GM-11 873-01). Work assisted by Grant AI-02908 (National Institutes of Health). 

Received May 13, 1965. Information paper, Washington Agricultural Experiment Stations. Work conducted under Project 1638. 

Gates Chemical Laboratory, California Institute of Technology (Received May 7, 1930)... 

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