LINNEAN SOCIETY OF LONDON*. ^ 



broad spaces are inecliaii.ually " routed, " and the plate is mounted 

 on wood nearly type-high. This process is only suited to drawings 

 ill line or stipple. 



Half-tone is a more delicate jiroce.ss, and eaii be emjjloyed in 

 copying various degrees of sliading. At the present time a 

 sciven of two sheets of ruled glass, crossed and cemented, is 

 pl.u-ed in the camera near the sensitive plate; this screen is ruled 

 fiH)m about 70 lines to the inch, for ne\vsi)aper work, to 20U for 

 the highest kiiid on art p;ii)er. The crossing of the two series of 

 lines produces a series of dots, white in the darks, black in the 

 liglits, acting as pin-hole lenses. 



Photogravure was next described, but its place in botanic 

 illustration is small, o\\ ing to its cost. 



Collotype is printing from a gelatine film, giving beautiful and 

 graduated results without any perceptible grain. 



.Specimens of the blocks and of plates resulting from the 

 described processes were shown on the table. 



The President having spoken, Mr. A. J. W ilmott referred to 

 the sti]:)ple-process and the usage of W. Curtis in ])rinting the 

 outlines of his 'Flora Londinensis ' in colour, thus aiding the 

 after application of colour. 



The Lecturer, in reply, regretted that the large amount of 

 material which bad to be compressed into one lecture instead of 

 several, hail caused many of his sections to be omitted ; he then 

 instanced Hedoutc's work in stipple, which was printed in the 

 colours ap])ropriate to each part of the plate, the print being 

 linisbed by hand-colouring. 



February oth, 1'J2U. 



Dr. A. Smitu Woodavard, F.Ii.S., President, 

 in the Chair. 



The Minutes of the General Meeting of the loth January, 

 19-!0, were read and conlirmed. 



The report of the Donations received since the last Meeting 

 w;is laid before the Fellows, and the thanks of the Society to the 

 several Donors were ordered. 



^Ir. Leonard John Sedgwick Mas admitted a Fellow. 



The PresidenI announced the vaciincies in the list of Foreifrn 

 ALembers, caused by the deaths of Prof. AVilliam Gibson Farlow, 

 Prof. Ernst Heinrich Pbilipi) August llaeckel. Prof. Gustaf 

 ]\lagnns lietzius, Prof. Simon >Sch\\ endener, and Prof. Hermann 

 von Vochtint;-. 



