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To Francis Darwin   [before 15 April 1873]

Summary

Sends to Pantlludw [North Wales] bottle of formic acid. FD and Amy [Darwin] can search for spawn. If found, keep in two basins and add 6 drops of acid to one and look for differences.

Author:  Charles Robert Darwin
Addressee:  Francis Darwin
Date:  [before 15 Apr 1873]
Classmark:  DAR 271.4: 6
Letter no:  DCP-LETT-8848A

To Francis Darwin   16 April [1873]

Summary

"Try only 1 or 2 drops of Formic A[cid]."

Author:  Charles Robert Darwin
Addressee:  Francis Darwin
Date:  16 Apr [1873]
Classmark:  DAR 271.3: 6
Letter no:  DCP-LETT-8862

To Francis Darwin   [17 April 1873]

Summary

Fears all the seeds are dead. Will try with less vapour of formic acid.

Author:  Charles Robert Darwin
Addressee:  Francis Darwin
Date:  [17 Apr 1873]
Classmark:  DAR 271.3: 7
Letter no:  DCP-LETT-8866
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letter (3)
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Darwin, Francisdisabled_by_default
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