My dear and most honoured Sir,—

I am very much obliged for your kind letter, and delayed only to answer, whilst I could not tell you, if I was to come over to England.¹ Now I am exceedingly fatigued by practical work, my friend D^r. Snellen, my partner in practice having been obliged to take a rather long holiday, and I feel that after his return—at the 16 of July—I have to spend a few days quietly near the sea, for seeing if I become able to support the fatigues of a Congress (opthalmological) at the 1^st. of August in London.² Certainly, I hope so, and in the case I come in London, I will be most happy to avail my-self of your kind invitation to pass a day in your house and in your family. So we would find plenty time to speak about some physiological questions, if you like to do so. I suppose that my friend Bowman will like very much to come also.³

I think, it is not necessary to tell you again that it will be a pleasure and a great honour to me, at any time, to do for facilitating your physiological studies any thing I am able to do. I am always learning by trying to answer to your questions and I would do it not less by reading over some chapters of your book.—⁴

With the greatest consideration and sincere attachment | Yours very truly | Donders