Before agar, microbiologists had experimented with other foodstuffs as microbial media. They turned to substances rich in the starches, proteins, sugars, fats, and minerals that organisms need for growth, testing with broths, bread, potatoes, polenta, egg whites, coagulated blood serums, and gelatine. However, none worked particularly well: all were easily broken down by heat and microbial enzymes, and their surface, once colonized, became mushy and unsuitable for isolating microbes.
The pieces of this medieval puzzle are starting to come together. But there are still some questions.
在黔北，仡佬族人家的餐桌上，灰豆腐几乎四季不离。杀了年猪、熏好腊肉，积下的柏树灰是舍不得浪费的，细细筛了，收起装好，那是做灰豆腐最好的材料。从豆子到豆腐，再到灰豆腐，慢工细活，没个两三天完不成。但黔北人就是喜欢这样慢慢地过活，细水长流才是生活的真谛。。搜狗输入法下载是该领域的重要参考
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