. Annals of some remarkable aërial and alpine voyages, including those of the author : to which are added, observations on the partial deafness to which aerial and mountain travellers are liable, and an essay on the flight and migration of birds, the whole being intended as supplementary to "Researches about atmospheric phenomena" . power of flight in birds are subjoined. Sect. I.—On Migratory Birds. I propose in particular that accurate notes should be made byvoyaffeurs of the arrival and departure of birds in the countries inwhich they mav travel, distinguishing always the species. For exam
. Annals of some remarkable aërial and alpine voyages, including those of the author : to which are added, observations on the partial deafness to which aerial and mountain travellers are liable, and an essay on the flight and migration of birds, the whole being intended as supplementary to "Researches about atmospheric phenomena" . power of flight in birds are subjoined. Sect. I.—On Migratory Birds. I propose in particular that accurate notes should be made byvoyaffeurs of the arrival and departure of birds in the countries inwhich they mav travel, distinguishing always the species. For example,it would be interesting to know how long the swallows arc in going fromhence to Senegal, where it appears they arrive in autumn, soon afterthey leave us.* The engravings in the subjoined pages will enable the reader todistinguish the several species. The same observation applies to Wood-cocks, Quails, Cranes, Storks, and other migratory fowls. By mul-tiplying such observations we shall acquire a more accurate knowledgeof the space traversed by birds in a given time, and shall be able thebetter to estimate their mechanical powers. The following are the distinguishing marks of the four species otSwallow which visit France, England, and other temperate parts ofEurope ; and I have subjoined the European names for each HIRUNDO RUSTICA. H. Domestica.—H. Hirundo domestica—French. LHirondelle domestique, or See mv Tract On the Brumal Retreat of the Swallow.—London. 1807 107 IHirondelle de Cheminee—Italian. La Rondine Caniino—Portuguese. A Andorinha de Chammine—Spanish. La Golondrina dc Chimenea German. Rauch Schwalbe, Feuer Schwalbe, Kiichen Schwalbe, BaurenSchwalbe, or Bauern Schwalbe—Swedish. Ladu Swala—English. House Swallow, or Chimney Swallow—Gaelic. Gobhlangaoithe Danish. Mark Svale, or Forstue Svale—Dutch. Boeren Zwaluw. The length of this species is about six inches, breadth from tip to tipof the extended wings about twelve ;
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