Handy man's workshop and laboratory . Fig. 185—Carbon disulphide and glycerin side by side under the influence of the three factors which determine its shape,i. e., adhesion, cohesion, and a small difference in density, it bendsitself and becomes more or less S shaped. While handling carbon disulphide, one should always bear in 210 HANDY MAN S WORKSHOP AND LABORATORY mind that this liquid takes fire even more readily than gasoline,and that its vapor is poisonous. The latter inconvenience is thelesser, because the nature and intensity of the smell of the com-mercial product are such as to cause
Handy man's workshop and laboratory . Fig. 185—Carbon disulphide and glycerin side by side under the influence of the three factors which determine its shape,i. e., adhesion, cohesion, and a small difference in density, it bendsitself and becomes more or less S shaped. While handling carbon disulphide, one should always bear in 210 HANDY MAN S WORKSHOP AND LABORATORY mind that this liquid takes fire even more readily than gasoline,and that its vapor is poisonous. The latter inconvenience is thelesser, because the nature and intensity of the smell of the com-mercial product are such as to cause one to step back when thevapor reaches the nostrils.—58 BLUE ROSES The roses shown on the accompanying figure are white with adelicate and beautiful network of blue veins. Such roses can be. Fig. 186—The roses are covered with a network of blue veins obtained in little more than one hour by placing the followingsolution, instead of water, in the vase in which the cut ends ofthe stalks are dipping: HANDY MANS WORKSHOP AND LABORATORY 211 Water ioo cubic centimeters. Aniline methylene blue 2 grammes. Potassium nitrate 2 grammes. School boys know that white roses can be transformed into redflowers by allowing the cut end to remain some time in somekinds of red ink. The writer tried to obtain similar results witha number of aniline dyes and found that while some, like anilinered scarlet, for cotton, readily rise into the vessels of the stalk,others, like aniline methyl green, will not, under any circum-stances reach the flowers. Some common salts were added tothe dyes and one of them, potassium nitrate (saltpeter) wasfound to exert a powerful influence over the ascent of the dyes,which rise then rapidly and in considerable quantities. Theexperiment is curious and should be r
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