389 
waters of the Geysers and other hot-springs in Iceland. The per- 
centage of Sulphur in the Krisuvik sulphur-muds is unusually high , 
being from 96*39 to 98*20 of pure sulphur, while the crude Sicilian 
sulphurs generally contain not above 80 to 90 per cent. 
(4.) Hints to Naturalists anent Natural History Expeditions to 
Iceland. 
2. On the Pediculi infesting the Different Races of Man. 
By Andrew Murray. 
The object of this paper was to determine whether the pediculi 
infesting the different races of man were of the same or of distinct 
species, and thereby to ascertain whether any inference could be 
drawn therefrom, bearing upon the disputed question of the unity of 
the human species. 
The author had obtained specimens of pediculi taken from sixteen 
or eighteen different races of mankind, and had discovered certain 
minute differences which appeared to be constant in the different 
races. These differences, however, did not appear so different in 
particulars, or marked in degree, as to justify their being considered 
different species. 
The following Donations were received : — 
Transactions of the Historic Society of Lancashire and Cheshire. 
Vol. XII. 1860. 8vo. — From the Society. 
Transactions of the Medico-Chirurgical Society. Vol. XLIII. 8vo. 
— From the Society. 
Atti del R. Istituto Lombardo di Scienze, Lettere ed Arti. Fasc. 
17-20. 4to. — From the Institute. 
Quarterly Journal of Geological Society. Vol. XVI., Part 4.— 
From the Society. 
Transactions of the Academy of St Louis. 1859. 8vo. — From 
the Academy. 
Journal of the Proceedings of the Linnean Society. Vol. V., 
No. 18. — From the Society. 
Comptes Rendus Hebdomadaires des Seances de l’Academie des 
Sciences. Tom. LI., Nos. 22, 23. — From the Academy. 
Memoranda on Vegetation. By John Hunter, F.R.S. London, 
1860. 4to. — From the Royal College of Surgeons, London. 
