From F. C. Donders 17 May 1870
Summary
The illness and death of his daughter have delayed his answers to CD’s queries. He has, however, worked on the circulation of the eye and has almost finished a paper on it, which he will send to CD. In general, the views of Charles Bell are confirmed.
As for CD’s second query, he doubts that the relationship exists, but will answer fully in next letter.
| Author: | Frans Cornelis (Franciscus Cornelius) Donders |
| Addressee: | Charles Robert Darwin |
| Date: | 17 May 1870 |
| Classmark: | DAR 162: 224 |
| Letter no: | DCP-LETT-7141 |
From F. C. Donders 27 May 1870
Summary
Has finished the article [on the action of the eyelids in Ned. Arch. Geneeskd. & Natuurkd. 5 (1870), also see 7238]; summarises: the occlusion of the eyelids protects the vessels, and the eye itself, against the danger of pressure caused by excessive expiratory action. The weakness of the conclusion is that the extent of the danger caused by the pressure to the normal state of the eye is not precisely known.
| Author: | Frans Cornelis (Franciscus Cornelius) Donders |
| Addressee: | Charles Robert Darwin |
| Date: | 27 May 1870 |
| Classmark: | DAR 162: 225 |
| Letter no: | DCP-LETT-7203 |
From F. C. Donders 28 May 1870
Summary
A detailed description of the physiological and anatomical processes related to the prolonged involuntary contraction of the orbicular muscles and the secretion of tears (as in retching, violent coughing, or laughing). [See Expression, p. 160.].
| Author: | Frans Cornelis (Franciscus Cornelius) Donders |
| Addressee: | Charles Robert Darwin |
| Date: | 28 May 1870 |
| Classmark: | DAR 162: 226 |
| Letter no: | DCP-LETT-7207 |
