550 
MB. J. H. GURNEY ON IRISH ROCK BIRDS. 
which bites by day, is the intermediate host. A third kind 
F. perstans, present in the blood both day and night has also been 
observed in Africa ; but of this, at present, very little seems to he 
known. 
Fortunately the parasite is not indigenous in this country, and 
hut very few cases, and those exclusively in persons who have 
resided in hot countries, and have brought it here with them, have 
been seen ; but in the district of Amoy Dr. Manson estimates that 
very nearly one eighth of the population are affected, and that no 
kind of occupation, except perhaps those of a seafaring character, 
secures exemption from Filaria. 
II. 
IRISH ROCK BIRDS. 
By J. H. Gurney, F.L.S., Y.-P. 
Read 26th September, 1893. 
The Great Saltee which is, in part, the subject of this paper is 
one of two Irish islands off the coast of Wexford, and can be 
reached from the mainland, with a good breeze, in half an hour. 
It is a lofty pile of granite, two hundred acres in extent, and 
I think I can saj r something about the Bird-life which is its marvel 
in the summer-time, to pass away half an hour this evening. But 
I must premise that a good deal has been written about it already, 
and I shall not repeat what has been already better said by 
Mi\ Richard Ussher, who nearly lost his life on this island, in the 
‘Zoologist,’ 1886, p. 88, and by Mr. Henry Seebohm in the ‘Ibis,’ 
1890, p. 404. 
The south-eastern side of the island, rising to 198 feet above the 
sea, is precipitous, though parts of it are amenable to an active 
