. The Journal of laboratory and clinical medicine . ws very slight differentiation. From this it follows that the color tints vary from 8 to 0 at the rateof the logarithms of their dilution-ratios. The stock solution of Liquid 8 is quite permanent if kept in the appreciable deterioration in color value was found after nine months stand-ing when compared with a freshly prepared solution. The solution in the tubesof the color scale keeps equally well if the tubes are of hard glass and are care-fullv cleaned before being filled, and are then well sealed. 8 THE JOURXAL OF LABORATORY AND CL
. The Journal of laboratory and clinical medicine . ws very slight differentiation. From this it follows that the color tints vary from 8 to 0 at the rateof the logarithms of their dilution-ratios. The stock solution of Liquid 8 is quite permanent if kept in the appreciable deterioration in color value was found after nine months stand-ing when compared with a freshly prepared solution. The solution in the tubesof the color scale keeps equally well if the tubes are of hard glass and are care-fullv cleaned before being filled, and are then well sealed. 8 THE JOURXAL OF LABORATORY AND CLIXICAL MEDICIXE The comparison of tests with the standard tubes is facilitated by the use ofa color-comparison box such as is shown in Fig. 2. The tube whose index is to be determined is placed into the middle hole andtubes of a higher and lower index from the color scale are placed on either sideof it. In this way close approximations are made possible. If a specimen ofserum has itself a marked tint, a tube containing one dose of serum diluted to. -Fig- 1-—Color indices i)lotted against dilution ratios of color
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