Plays also are popular which are cast in the times when picturesque attire flourished or which borrow it from Oriental countries. The significance of colour is exceedingly far reaching. The ordinary liveries of Royalty in this country are red; the red shirt of the followers of Garibaldi, the red cap of Liberty in the French Revolution, the red rose of Lancaster, call to mind great struggles. The platelayer, it is said, is instructed to wear a red tie so that on emergency it may be used as a danger signal. A red ribbon worn in the hair of a girl in some places on the Continent shows that she is engaged to be married, and it is with a red rag that the chulos in the bull fight enrage the bull. The term "born in the purple" alludes to this colour having been that adopted by emperors and kings in the past. Yellow is a favourite colour with gipsies; the women wear yellow kerchiefs and yellow beads, while the men favour yellow neckties. Mr. Yoxall[51] points out that this colour was worn by mediæval Jews, and had a contemptuous or degrading significance. We have seen that yellow has been chosen as a mourning colour in Oriental countries, and possibly it was adopted on some particular occasion by gipsies like the black worms that we have mentioned in the lace of military uniforms, and has never been entirely left off since. Among savages, yellow comes next in popularity to red, and it is said that young children are also fond of red, but are inclined to prefer yellow. The latter colour is not so stimulating as red, and this is well shown by the fact that the red light used in photographic works was found to cause so much mental irritation on the part of the workers that it has been abandoned in many cases in favour of orange. As regards the preference of older persons, it has been found that schoolgirls are more precocious than boys in the discrimination of colours, and never prefer orange to any other colour, yet they choose yellow rather than green, and usually than violet, but never prefer it to red or blue.