220 COLOR-BLINDNESS : I have thus given Holmgren’s precise descrip¬ tion of the worsted-test as he carries it out. My own experience has been to lead me to employ the seemingly longer method with the larger number of greens. Therefore I add here the exact de¬ scription given in the original in full of the way of conducting it. To those of my readers who may consider it superfluous or unnecessarily ex¬ tended, I would say, try and go on with the test alone amongst those with whom a mistake on your part would be fatal, and you will gladly turn back and carefully study this following chapter, with thanks to Holmgren for it.