unfertilised eggs of insects have been started into growth by treatment with acids and those of frogs with mercury salts, and the germination of beans quickened by various poisonous alkaloids.
"Disease in Plants"
H. Marshall Ward
In all cases in which the unfertilised egg has been treated in such a way as to cause it to form a membrane it begins to develop.
"Darwin and Modern Science"
A.C. Seward and Others
For the eggs of certain animals membrane-formation is all that is required to induce a complete development of the unfertilised egg, e.
"Darwin and Modern Science"
A.C. Seward and Others