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" ... the use of the albumin in clearing wine, and other disturbances which had formerly caused havoc in the colonies, ceased at once. The old method of extracting guano without regard to the presence or physiological condition of the birds has, of course,... "
Ibero-amerikanische bibliographie - Pagina 148
1924
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Science, Volume 53

John Michels (Journalist) - 1921 - 620 pagina’s
...physiological condition of the birds has, of course, been abolished, the islands, under the new rule, being worked according to a system of rotation which...vacated and is thereafter given over to the complete possession of the birds for a period of approximately thirty months, at the expiration of which the...
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The Brooklyn Museum Quarterly, Volumes 7-9

1920 - 782 pagina’s
...physiological condition of the birds has, of course, been abolished, the islands, under the new rule, being worked according to a system of rotation which...vacated and is thereafter given over to the complete possession of the birds for a period of approximately thirty months, at the expiration of which the...
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Science, Volume 53

John Michels (Journalist) - 1921 - 694 pagina’s
...physiological condition of the birds has, of course, been abolished, the islands, under the new rule, being worked according to a system of rotation which...vacated and is thereafter given over to the complete possession of the birds for a period of approximately thirty months, at the expiration of which the...
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Science, Volume 53

John Michels (Journalist) - 1921 - 660 pagina’s
...physiological condition of the birds has, of course, been abolished, the islands, under the new rule, being worked according to a system of rotation which...vacated and is thereafter given over to the complete possession of the birds for a period of approximately thirty months, at the expiration of which the...
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Science, Volume 53

1921 - 604 pagina’s
...physiological condition of the birds has, of course, been abolished, the islands, under the new rule, being worked according to a system of rotation which...breeding grounds always available. Courting or nesting birde are now carefully shielded from disturbance. Moreover, after removal of the guano, an island...
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Bird Islands of Peru: The Record of a Sojourn on the West Coast

Robert Cushman Murphy - 1925 - 460 pagina’s
...presence or condition of the birds has, of course, been abolished. The islands, under the new rule, are worked according to a system of rotation which leaves...grounds always available. Courting or nesting birds are shielded with particular care. Moreover, after removal of the guano, an island is promptly vacated...
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