PROCEEDINGS OF SOCIETIES. 
175 
The object was very flat, and I conceive that it would require very 
careful manipulation to display it. 
2. In Navicula crassinervis the lines were distinct when viewed 
under a ^^th immersion objective. 
3. Two specimens oi Frustulia Saxonica were shown with a ^Lth 
immersion glass, in one of which the lines appeared somewhat coarse, 
while in the other (mounted by Eodig) the lines were remarkably fine. 
4. A select slide of Surirella gemma displayed fine markings under 
the J^th objective, while with another slide of the same (taking the 
objects just as they came) under the same objective, the lines were 
less finely seen, though tolerably distinguishable. All the above 
objects were viewed by very oblique light. 
Some diatoms were then shown to me by straight candle-light, 
which I had never before seen so displayed. Under a ^th. dry objective 
the following were noteworthy : 
1. Navicula cus^idata, dry; two different slides by Lind, and 
another slide of the same in balsam, by Topping. 
2. Nitzschia sigmoidea, mounted dry by Norman. 
3. Hyalodiscus suhtilis, mounted in balsam by Topping. 
4. Navicula rhomhoides, dry, by Norman. 
The above four diatoms were distinctly seen, to my surprise and 
pleasure, by a foreign ^th. The same objective was brought to bear 
- on Papilio janira (known to the readers and friends of Dr. Frey), but 
here it proved a comparative failure with direct light, while under 
oblique light the cross markings were clearly seen. 
I will not take up additional space with further details on the 
above, or on less remarkable exhibitions of less difficult diatoms. 
Your humble servant, 
J. Leifohild, 
PEOCEEDINGS OF SOCIETIES. 
EoYAL Microscopical Society. 
King's College, March 3, 1875. 
H. C. Sorby, Esq., F.R.S., President, in the chair. 
The President, having been introduced to the meeting by his 
predecessor in office (Mr. Chas. Brooke), said that in taking the chair 
for the first time as President of that Society, he begged that the 
Fellows would allow him to express how much he felt the honour 
which they had done to him. He had heard it said that there could 
be no greater honour than being elected President of an important 
scientific Society, since those on whom the election depended were of 
all men the best qualified to judge of the fitness of him who was 
chosen for the office. It would be affectation on his part if he were 
to say that he had not adequately devoted himself to the microscope, 
