angle of 65°, aa moch as anv painter would represent on 
canvas, alluding lastly to Rosa's doublet and Grubb's 
aplanatic lenses, which had great penetration. As the lens 
best adapted for all kinds of work, he recommended Rosa's 
triplet. The latter part of Mr. Beattie's address contained 
an account of the various agents which had been tried and 
I employed to retard the action of the iron developer now 
used for pictures taken with bromo-iodised collodion, such 
as gelatine, glycosine, honey, &c., and be concluded by 
speaking of the so-called instantaneous photography, in 
which no new or secret processes were employed, a good 
developer, a nearly new bath, and rapid exposure being all 
that were necessary, 
I Zoological Section, Nov. 9.— Mr, E. A. Praeger in the 
chair. Mr, W. W. Stoddart exhibited his unique collection 
of otoliths of recent fishes, the study of which had, he said, 
demonstrated the fact of a form beinff peculiar to the 
species and not to the genus. He briefly described the 
comparative anatomy of the auditory organ in various 
groups of animals, commencing with the Rhizostoraa, 
pointing out, as the essential part, a cavity filled with fluid, 
and containing a solid bodv vibrating inside of greater 
specific gravity than the fluid, Mr. Stoddart then dis- 
sected the head of a hake, and showed the otoliths 
in situ, saving that he considered tbem as the 
analogues of the malleus, incus, and stapes in the 
human ear. The president. Dr. H. Fripp, after paying a 
tribute to the unwearied industry displayed by Mr. Stod- 
dart, drew attention to the difference between homologue^ 
and analogues, pointinsr out that many thing's which seemed 
to oerform the same office were not necessarily the same ia 
anatomical function. Histologically, a bone was a bone, 
and he objected to that term being applied to these otoliths, 
which had no organic structure, although they represented 
an early stage in the histology of bone. Mr. T. (j. Ponton 
exhibited two species of slugs, which had not hitherto been 
taken in this neighbourhood, Arion hortensis and Limax 
Sowerbyi, and read Forbes and Hanley's description of them, 
Mr. Groome Napier exhibited an enormous duck's egg, 4^ 
inches long, and 7^ inchpsin circumference, which contained, 
bejiides its own white and yoke, another complete egg, also 
perfect in all respects. It was considered that the pheno- 
menon arose from the accidental enclosure of two germinal 
spots in one germinal membrane, Mr. "W. L. Carpenter 
read an extract from a Brazilian paper, relative to the recent 
discovery bv Professor Agassiy of many new species of fish 
in the Amazon. 
Entomological Section, Nov. 14.— Mr. Barton, pre- 
sident, in the chair. The president read a paper on two 
aperties of Cenatorhina. a genus of the Goliath beetles, found 
in West Africa. In 1773 Drury had described and figured a 
species under the name of Scarabeus Micans, and shortly 
afterwards specimens, very similar, found their way to many 
European cabinets under this name. Recentlv, however, 
specimens had befn sent to the author which were pro- 
pounced by eminent authorities to be the real Sc. micans of 
