459 
PROCEEDINGS OP THE SOCIETY. 
Meeting of the 21st of June, 1899, at 20 Hanover Square, W. 
The President (E. M. Nelson, Esq.) in the Chair. 
The Minutes of the Meeting of the 17th of May last were read 
and confirmed, and were signed by the President. 
The List of Donations to the Society — exclusive of exchanges and 
reprints — received since the last Meeting was submitted, and the thanks 
of the Society were voted to the Donors. 
From 
Board of Agriculture, Annual Report of Proceedings under 
the Diseases of Animals Acts, for the year 1898. (8vo, 
London, 1899) 
Dr. Henri Van Heurck, Traite des Diatomees. (4 to, 
Anvers, 1899) 
Prof. Ettore de Toni, Diatonlee del antico corso Plavense, 
(4to, Padova, 1899) 
1/8-in. Objective made by Andrew Ross for the late Prof. 
Lindley 
The Board of 
Agriculture. 
The Author. 
The Author. 
The Bight Hon. 
Sir Nathaniel Lindley. 
The President exhibited an old 1/8 objective, made by Andrew Ross, 
which had been presented to the Society by the Master of the Rolls. It 
was an interesting and very rare form of objective, constructed probably 
about the year 1838, which possessed a very primitive form of lens ad- 
justment. As lens correction was first invented in 1837, and screw 
collar correction came into use in 1839, very few objectives of this pattern 
could have been made. This particular one had a special interest for 
them, because it formerly belonged to the father of the donor, Prof. John 
Lindley, the second President of this Society (1842-3). He felt sure 
that the Meeting would give Lord J ustice Lindley a very hearty vote of 
thanks for the presentation (see p. 436 and fig. 103). 
The President said he had received a new coarse adjustment from 
Messrs. Watson and Son who had acted very promptly upon a suggestion 
made by him in a paper he read before the Society in March last, and 
had sent the result to show that with a loose pinion it was possible to 
have a rackwork that would work without “ loss of time.” If it showed 
signs of wear, the second rack could always be stepped a little more, 
which would put it in perfect adjustment again. 
The thanks of the Society were given to Messrs. Watson for sending 
this model for their inspection. 
A paper by Mr. Jas. Yate Johnson, entitled * Notes on some Sponges 
belonging to the Clionidse, obtained at Madeira,’ was taken as read, it 
