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This latter point would suggest that in bubble-free . glass there is a greater possibility for cases of want of homogeneity to occur-a point that is worthy of con sideration. Striae (Veins).-This defect is produced during the melting operation, and is the cause which necessitates the rejection of the major portion of the glass made. The two terms are used to describe the same defect, although the term "veins" is generally reserved to describe heavy strire. The most important source of strire isdoi:10.1038/scientificamerican02051916-87bsupp fatcat:p6vtgrwtb5br3i7zerkuvvl5sq