Geology and Natural History. 59 
of it, after drying in the air, was found to contain 27 p. ¢. of th 
phosphate of lime, with 63°5 of fine er sepa oN and coarse 
sand, 3°0 of carbonate and sulphate of lime, 6°5 moisture an 
— satis: By agitation in water the lighter floceulent 
art may be napa off, and the phosphatic portion thus 
saa tented to 37 cent of the remainder. Prof Shepard 
observes that this pry deposit appears to be very extensive. He 
suggests that it may require, after washing, to be treated with 
sulphuric acid, at the rate perhaps of 100 pounds to the ton; the 
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5, CouEs on Antéerpodecior pclae Tha t ey anterior 
and posterior limbs of vertebrates are homologous is now ad- 
tropy,” the latter, ‘ ‘Antitropy3” a nd the advocates of these ideas, 
Sh ropists ”” and “ Antitropists » respectively. 
latter have lately been joined by a vigorous ally, to whose 
work attention has already been called ;{ and the accession is the 
and the primus of os (little finger). The propriety of this 
view is a admirably presented by Wyman,§ together wit the ob- 
vious objections thereto and the grounds upon which these objec- 
tions may be removed.% 
by * Ante sterior ial refi to the Museles of the Bee) 
Euuiorr Cour ae ‘Assist, Surg. U.8. A.; New York Medical 
18, ke pp. 149-152, se Sane 999-294 272-274, 297-299, 370-372, 390- 
tone “Danis Foltz, Wyman and the writer. 
t American area 5 1871. 
Symmetry an and Homology in Limbs, Piet . Bost. Soc. Nat. Hist., June 5th, 18 
The general and special questions here —— roa pes discussed ot by me 
at Several times since ig a re first sug o me erbal communication 
ones oie ‘aoa t Soc. Nat. Hist, Jone ty 1900: and I <r shall shortly 
a nati nod pape er upon the subject (Proc . Bost. Soc. Nat. Hist., 
a 19th, Isnt) containing th g: ie 
: = torical sketch of the prot a A eee of Ano fs sai 
phical Trevislo! of ideas. 4. Evide = 
ical incons seme var poreanah on. 5. Indication of general problems. 
- “nme of special problems. 7. Chronological list of 76 ee works upon 
‘termembral homologies. 8, Alphabetical list of 227 collateral wor 
