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 bear all that in mind. Doubtless he can, more or less; but I am inclined to believe more strongly in the less. At any rate he will much more certainly have them in view whilst he keeps them visibly before his eyes. One thing that deters him is the fear of offending the client, who will not believe, when he sees leads and bars in a drawing, how little they are likely to assert themselves in the glass.

Very much the same thing applies to designs and working drawings generally. A thorough craftsman never suggests a form or colour without realising in his own mind how he will be able to get such form or colour in the actual work; and in his working drawing he explains that fully, making allowance even for some not impossible dulness of apprehension on the part of the executant. Thus, if a pattern is to be woven he indicates the cards to be employed, he 256