62 PROCEEDINGS OF SOCIETIES. 
arm e f fits, and turns on the pivot g. The lower part of the 
groove is occupied by a small spring (#) which keeps the points of 
the forceps closed. 
The pivot should be placed below the disc so as to admit of the 
points of the forceps being brought as near as possible to the 
upper surface of the disc, and yet allow them to open sufficiently 
wide to be practically useful. 
He found that if the points of the forceps project about an 
eighth of an inch above the dise the whole of an object held in 
them (except, of course, that part actually covered by the forceps) 
can be viewed with a 2-inch object-glass without any difficulty. 
The advantage of this little piece of apparatus will be obvious 
to any one who has fumbled for half an hour or more over a com- 
mon pair of forceps, a pin, and a piece of cork, without, perhaps, 
in the end obtaining a good view of his object in the required 
position. But it has more important uses than simplifying ma- 
nipulation, for it enables the same specimen to be viewed and 
drawn in any number of positions and aspects, while by the old 
method several specimens must generally be employed when dif- 
ferent views are required, on account of the difficulty attending 
the taking of a minute and delicate object out of the forceps and 
replacing it in another position without damaging it, thus often, 
perhaps, leading to error. 
Mr. Woodworth showed a considerable number of excellent 
photographs of microscopic objects on various enlarged scales ; 
amongst these were tongue of cricket, saw of saw-fly, jaw of 
spider, butterfly scales, &c., &c. These all showed the minute 
structure beautifully. Mr. Woodworth stated his intention to 
continue his experiments in this direction. 
Dr. Moore showed illustrations of Dr. Seemann’s characters for 
distinguishing the British, Canary, and Asiatic species of ivy, by 
the hairs on their calycine segments and petioles of the flowers. 
The common ivy, with its varieties, were shown to have the hairs 
with eight rays, which is very constantly the case. The hairs on 
Hedera Canariensis have as constantly from eleven to fifteen rays ; 
whilst the Asiatic ivy, Hedera colchica (Koch) has the hairs on the 
calyx and pedicles in two-lobed scales, each lobe having*from seven 
totenrays. Dr. Moore, however, stated that he could not reconcile 
his views with those expressed by Dr. Seemann, in considering the 
large-leaved ivy, cultivated as Hedera Regneriana in gardens, 
and the very rare, small-leaved, yellow-fruited one from the 
Himalayan Mountains, Hedera chrysocarpa (Wallich), being states 
of one species. 
Dr. Moore drew attention to the rapid growth in the Victoria 
Tank, in the Botanical Garden, of a species of Spirogyra, seem- 
ingly S. longata. In eleven days, since the tank was filled, this 
plant had covered surfaces of many feet. 
