INDEX GENERUM ET SPECIERUM ANIMALIUM. 347 
Index Generum et Specierum Animalium.—Report of the Committee, 
consisting of Dr. HENRY WoopwarD (Chawman), Dr. F. A. BATHER 
(Secretary), Dr. P. L. Scuater, Rev. T. R. R. Strespine, Dr. W. 
EK. Hoy.e, Hon. WaLtTeR RoruscHiLp, and Lord WALSINGHAM. 
THE indexing of the literature for the second portion of this Index (1801- 
1850) has steadily progressed. Among the works included are :— 
‘ Archiv fiir Bergbau,’ &c., 43 vols. 
‘ Archiv fiir die gesammte Naturlehre,’ 27 vols. 
‘ Archiv fiir Naturgeschichte,’ 16 vols. 
‘ Athenzeum,’ 23 vols. 
Basel, ‘ Naturforschende Gesellschaft,’ 8 vols. 
Batavia, ‘ Batav. Genootsch.,’ 16 vols. 
‘ Beitraige zur Petrefactenkunde’ (Muensters). 
Berlin, ‘Gesellschaft naturforschende Freunde.’ 
Berlin, ‘ Bericht und Abhandlung k. pr. Akad. Wiss.,’ 50 vols. 
Also the writings of Audouin, Audebert, Audubon, Audinet, and Bech- 
stein, a list which might be considerably extended, 
The accumulated results of three years’ recording have now all been 
arranged and sorted under their respective genera, and therefore one set 
of entries is now available for reference by monographers so far as 
recording has proceeded. The duplicate set of entries has been par- 
tially arranged ; and further accommodation, provided by the kindness 
of Dr. Smith Woodward in the Geological Department of the British 
Museum (Natural History), has greatly relieved the pressure arising from 
the steady growth of material. 
The Committee ask for reappointment, and hope that a grant of 1001. 
will be given for the further preparation of the ‘Index Animalium’ by 
Mr. C. Davies Sherborn. 
Experiments on the Development of the Frog.—Report of the Com- 
mittee, consisting of Professor G. C. Bournk (Chairman), Dr. 
J. W. JENKINSON (Secretary), and Professor S. J. Hickson. 
(Drawn up by the Secretary.) 
On the Relation between the Symmetry of the Egg and the Symmetry 
of the Embryo in the Frog. 
For a satisfactory solution of this problem it is necessary to determine 
quantitatively, and to express in statistical form, the relative positions 
in the egg of (1) the meridional plane which includes the sperm path ; 
(2) the plane of symmetry of the unsegmented egg ; (3) the first furrow 
of segmentation, and (4) the sagittal plane of the embryo. It is not pos- 
sible to observe directly the relation between the first and fourth in one 
and the same egg, since all trace of the sperm path is lost by the time that 
the dorsal lip of the blastopore has appeared, but the angles between the 
first three or the last three may readily be measured in each of any 
number of eggs.. 
