Excerpt from The Identification of Acids: Dissertation Submitted to the Board of University Studies of the John Hopkins University in Partial Fulfillment of the Requirements for the Degree of Doctor of Philosophy
The various crops are designated 1 st 1 st and 1 st 2nd, etc., meaning 1 st crystallization 1 st crop and 1 st crystallization 2nd crop. The second crops were in most cases discarded, after weighing and getting the melting point since high purity rather than quantity was desired.
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