Good morrow, most esteemed colleagues.

I must relate a most peculiar and vexing development concerning my latest homunculus. Of late, a most untoward event hath transpired; the creature hath, for reasons yet obscure, sprouted wings—appendages which by no design of mine ought to be present.

Mine art was performed with all customary precision: I employed the customary admixture of human seed and blood, which I did then incubate within a spherical flask from SPL Lifescience, buried within a bed of equine manure for the duration of five lunar cycles. The vessel itself was oriented precisely towards the east, as is prescribed.

I confess, I am at a loss to comprehend what error may have occurred. As a preliminary precaution, I subjected all components to a most rigorous PCR assay for the detection of avian DNA. Furthermore, I myself assayed the homunculus's pseudoamniotic fluids. All tests returned a negative result.

What principle, then, may underlie this most aberrant occurrence? Whence could such atavisms have arisen? And what proposed rectifications for this predicament might you gentlemen deign to propose?