The American Apiculturist: A Journal for the Novice and Expert in Beekeeping; January 1-December 1, 1890. E-book. Formato PDF Henry Alley   -  Forgotten Books, 2017  - 

This is the reason why queenless bees will so readily rear drones even when a young queen is present in the hive. Should an attempt be made to rear drones from a young queen after she had been installed in the colony aweek or more, it would most likely result in failure. The bees would say we do not now need any drones we have a nice young ruler and we need no males till another year.

Manual of Paleontology for the Use of Students: With a General Introduction on the Principles of Paleontology. E-book. Formato PDF Henry Alleyne Nicholson   -  Forgotten Books, 2017  - 

Of the Tetrabranchiata — Anatomy of the Pearly Nautilus Shell of the Tetrabranchiata — Distribution of the Tetrabranch.

Manual of Paleontology, for the Use of Students: With a General Introduction on the Principles of Paleontology. E-book. Formato PDF Henry Alleyne Nicholson   -  Forgotten Books, 2017  - 

Geology and the general reader with a compendious account of the leading principles and facts of the vast and ever increasing science of Palaeontology. In carrying out this object, all super?uous details have been rigidly excluded, and the Author has endeavoured to restrict himself entirely to those facts which are absolutely necessary to any one who would study Palaeontology as a department of science.