SWALLOWS.
Before I proceed from birds to fishes, I think proper to subjoin a few remarks upon common hens and swallows, the latter of which no ways differ from those of Europe in appearance, voice, and habits. Although Paraguay is free from snow, yet as the south wind renders the air rather cold in winter, the swallows migrate like those of Europe to other places about the beginning of autumn, and pass the winter in some unknown retreats, but return at the commencement of spring.