Francis Aston wrote to Leeuwenhoek about the importance of his work

February 26, 1684

Letter Book Original volume 9 pp. 100v, 101

Mr. Aston to Mr. Leeuwenhoeck mentioning the Rec. of his 28 Dec. last & encouraging him to make Experiments &c.

I have received yours of the 28th of December last, but was long hindred from Answering by the Frost, which gave an unusuall interruption to commerce.

I am sorry to hear you mist of those Books, which I have enquired of, and find that they were sent with the usuall direction to Rotterdam. But you shall not be a looser, for as soon as the Transaction for December is printed, which I hope will be in a fortnight Ile send you to compleat the whole year. Mr. Boyle hath lately printed a Book called Memoirs for a Naturall History of Human blood. I will not fail to make your complements to him, for I have lately not been well. I shall be glad to hear from you, when ever you are at leasure. For I doubt not but the World hereafter will make very good use of the Stock and Treasure of Observations made with your Microscope, variety of Experiments and discoveries, being extreamly necessary to Philosophy, but Hypotheses and conclusions very uncertain, till such time as nature is fully discovered. And therefore our Society preferrs 4 Lines of matter of fact, written by yourself, or others, before a Volume of notions, which are only the work of the Brain. Gresham College London February 26th. 1683/4.