NATURAL HISTORY SOCIETY OF GLASGOW. 117 



him lies to make it more interesting and successful than any 

 preceding one. 



The Librarian reported that the books were all in good con- 

 dition, and that a considerable number of members had made use 

 of them. The sale of the Society's publications was steadily 

 increasing, and they were to be had for sale in London and on the 

 Continent. Exchanges were made with G4 societies — 22 British, 

 13 American, and 29 Continental. Donations of 6 volumes have 

 been made to the Library, and over 300 parts of the publications of 

 other societies have been received. 



Mr. Thomas King read the following Report on the proceedings 

 of the Summer Session, for which he was Secretary : — 



6th May, 1879. 



The first Summer Meeting of the Society, with which the Glasgow 

 Society of Field Naturalists had just been incorporated, was held in 

 Anderson's College this evening — Mr. W. J. Milligan in the chair. 



A Report of the Society's excursion of the previous Saturday 

 to Glenboig was given by Mr. Cairney, who had acted as conductor. 



Mr. Crawford then read a paper "On Recent piscoveries in 

 Spectrum Analysis and their bearings on the Kinetic Theory of 

 Gases," exhibiting several forms of Crookes' Radiometer, and ex- 

 plaining Professor Pye Smith's new method of observing end-on 

 spectra in gases. 



Mr. Schultze gave a paper " On Immersion Lenses for the 

 Microscope," and exhibited his beautiful and powerful instruments, 

 through one of which was seen plainly — without any trouble as to 

 focusing — the parallel lines on the diatom Amphipleura pellucida. 



May 20th, 1879. 



Mr. Gregorson in the chair. 



The Chairman exhibited specimens of Acer campestre, on which 

 lie made some remarks. 



Mr. M'Kay gave an account of the excursion to Hamilton on 

 the previous Saturday. The members of the party had inspected 

 the ancient oaks — remains of the old Caledonian Forest — and 

 the White Cattle. Chrysospleiiium altemifolium was found. 



Mr. Allan then read a paper containing observations on the 

 effects of the past winter. 



