Monsieur Leewenhoecks Letter to the publisher, wherein some account is given of the manner of his observing so great a number of little animals in divers forts of water, as was deliver'd in the next foregoing tract: English'd out of Dutch

Sir, I Received your Letters of the 12 th and 22 th of the last month; and I was not a little pleased, that my Observations about Water had not displeased your learned Philosophers.