Compare with these stores the one that "exemplifies a higher standard at each point under discussion; in the comprehensiveness of its ventilating system; in its observance of the spirit of the law in providing an average of four seats to a counter for its employees; in the fact that it has no Christmas overtime; ... and finally in its wage standard.... Seven hundred girls are paid $7.00; ... one hundred girls are paid $8.00 to $10.00, and sometimes $15.00 in the case of a head of stock." (Butler, l. c., p. 304.) Some glass factories furnish shutters over the leer-mouths to protect employees from heat;[39] prevent radiation from the melting tanks by various devices (l. c., p. 79); provide blue glass screens at the glory holes (ib.); artificially cool the shops in summer (l. c., p. 80); work shorter hours (p. 98); eliminate night-work (p. 104); provide hoods and exhausts for the etching baths (p. 322) and the sand blasts (p. 317). In one woolen factory the milligrams of dust in a cubic centimeter of air were reduced from twenty to seven by the installation of an exhauster.[40] The fact, too, that organizations such as trade unions and consumers' leagues can allow the use of their labels to certify that an article has been made under fair conditions, is a striking confirmation of the fact that some manufacturers do maintain proper factories and treat their employees justly. Nevertheless, competition has a black as well as a silver lining. It is self-evident that for any length of time laborers cannot get more than the total product of their work coupled with the necessary capital. Nor will it be denied that capitalists will always be in a position to appropriate a part of this joint product, how much depending very largely upon the relative supply of capital and labor and the keenness of competition between them. The share that is left and which goes to the laborers is not divided equally. It is distributed competitively. Those who are economically strongest seize what they can, and the weaklings must be content with the remainder. Frequently this is not sufficient to afford them the standard we are considering, but they are helpless to remedy matters.