"Persevering until they had perfectly mounted about 2,000 pairs" The article implies they threw away the samples that tore when mounting on glass plates. It sou

"Persevering until they had perfectly mounted about 2,000 pairs" The article implies they threw away the samples that tore when mounting on glass plates. It sounds like they introduced possibly a large bias in their sample of the wings. I suppose they considered this, but it's something to think about.