Maarten Etienne van Velden wrote Letter L-256 about his dissatisfaction with Leeuwenhoek's views on spontaneous generation in Letter L-255

May 30, 1695

This letter is known only by reference in Leeuwenhoek’s reply.

In this letter, Van Velden writes that he is not satisfied with Leeuwenhoek’s observations about the impossibility of small flies being generated from big caterpillars in his letter of 23 May.


Letter L-261 of 12 July 1695 to Maarten Etienne van Velden

Your welcome letter of the 30th of May duly reached me; I saw from it that you are not satisfied as to [my views about] the nest of flies, since you think that it is not composed of several small worms which have clustered together, but is due to a single cause.