Slide showing table demonstrating 'The Quality of Yeast Used.' Slide shows table demonstrating 'The Quality of Yeast Used.' The table has three columns and three rows. The first column/3 rows show 'Totals' and Greek Letters 'Alpha' and 'Beta' with various figures corresponding to the headings in columns 2 and 3. Column 2 is entitled 'Brewer's Yeast', column 3 is entitled 'Baker's Yeast'. No further information available. Late 19th to early 20th century