English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

In the autumn of 1927, Hughes, wishful to repeat the work of Harrison and Garrett (1926) on the induction of melanism in the Lepidoptera, visited my laboratory to consult me about material and methods. As a result of the information supplied, his investigations were initiated in the spring of 1928. Very soon, however, he informed me that his progress was being materially hampered by the fact that the broods with which he was dealing were “full of lethal factors.” This complaint he repeated with still greater emphasis when the important work with treated larvæ was proceeding. NowSelenia bilunaria has been a favourite experimental subject of mine for more than 25 years, and, further, my wild broods have been derived from no less than forty-seven different localities in England, Scotland, Wales, Ireland and Germany; in spite of these wide oppor­tunities, never at any time have I encountered trouble in rearing large broods, nor have any difficulties ever arisen which could be interpreted by appeal to lethal factors. Hence I was forced to suspect that Hughes’ cultures were probably infected with polyhedral disease (due to a filterable virus) or with others, sporozoan or bacterial in their origin.

The experimental induction of melanism, and other effects, in the geometrid moth Selenia bilunari esp