ee COU 
17 
A Course of Four Elementary Lectures on Light 
was given by Mr. P. E. Vizard, beginning on Monday, 
November 4th, the subjects dealt with being :— 
Old Views ; Wave Theory of Light ; Light as the Messenger from 
the Stars; Velocity of Light, measured by movements of Jupiter’s 
Satellites ; Refraction of Light; the Rainbow; Mirage; Refraction and 
Aberration of Light as regards the apparent position of Heavenly 
Bodies ; Reflection of Light; Mirrors; Albedo of Planets, &c, ; Colour ; 
the Spectrum; Primary and Complementary Colours; Colours of the 
Sky ; Colour-Blindness. The Telescope, its History and Construction ; 
Lenses ; the Human Eye; Inversion of Images on the Retina; Long 
and Short Sight ; Celestial Photography. 
The Lectures, which were well attended, were 
illustrated by Diagrams and Experiments-by Mr. Max 
Gysi. The last Lecture was illustrated by Lantern 
Slides. 
Watural bistory Section. 
Friday, 8th March, 1901. Mr. P. E. Vizard in 
the Chair. Exhibits of Cretaceous and Eocene fossils 
from the Isle of Wight were made by Mrs. Park. Mr. 
James E. Whitirig showed and made some re- 
marks upon a _ Blackheaded Gull (Larus ridt- 
bundus, Linn.) and a Kittiwake (/zssa tridacty/a, Linn.). 
The former had been found frozen to the ice on one of 
the Highgate Ponds some few days previously. Mr. 
Martin Jacoby exhibited a female Sparrow Hawk 
(Accipiter nisus, Linn.), and made some remarks upon 
this bird. 
Friday, 22nd March, 1901. Mr. George Avenell 
in the Chair. Mr. Martin Jacoby, F.E.S., gave a 
lecture on “The Insect World,” and illustrated it 
with numerous exhibits from his own collection. He 
