Some birds show a remarkable love for the same situation, in which they nest year after year for an incredible length of time. The same place is known to have been used by falcons for about a century and a quarter, and likely to continue if the birds are not molested. Blue Titmice are known to have selected the same quarters over a hundred years in unbroken succession.
On Forming a Collection.—My concluding remarks will be devoted to the guidance of such as require to make a collection of eggs.
Keep close watch on the building operations of the birds whose eggs are required. Dippers, Thrushes, and many others commence early in the spring, especially after a mild winter.
Take only one specimen, and not until you have reason to believe the bird has done laying. Never under any circumstances take an egg when you have ground to suppose incubation has commenced, or is in an advanced stage, for besides the cruelty of the thing, it will often be of no use.
The specimen being secured, it is taken for granted the collector is furnished with the necessary drill and blow-pipe, procurable at any naturalist's shop. The next proceeding is to drill a small hole exactly on the side of the egg, selecting that of a spotted one with the least characteristic marks on it. Then insert the end of the blow-pipe, or rather direct the current of air sent through it into the hole made, being careful with small eggs not to burst them, or squeeze them until they collapse under the pressure of the fingers. When the contents have been emptied wash the egg out with clean water, introduced through the blow-pipe, being careful not to wet the outside more than necessary, or rub it too much, as the beautiful colouring of many eggs is easily displaced. When the egg has been blown, and properly dried inside and out, an operation needing some care, the hole should be covered over with a neat piece of gummed paper, on which the name of the specimen may be written, this being found especially useful when eggs of different kinds get mixed.
A small label should also be attached to the compartment allotted to each egg in the cabinet, bearing the name, locality in which it was found, and date, as such memoranda are often very useful, and inculcate habits of systematic study and storage of information sometimes impossible to remember. Besides this, a very good plan is to keep a note-book in which to enter such particulars and data concerning each specimen as may prove of utility or interest in the study of oology.
Of course it is impossible to obtain many specimens, which are seldom or never found in certain districts, therefore it is necessary to buy such eggs, or exchange through the medium of advertisement, with collectors equally glad to avail themselves of such an arrangement.
I have no doubt about the pleasure a study of the subject affords, and if my little book assists to heighten it in any way I shall be satisfied.
R. KEARTON.