42 THE GEELONG NATURALIST. 
etc., in the fields only to.undergo further development; after remaining: 
in this situation for about 3 weeks it developes into a fly whose whole 
'existence seems only to mature, deposit her eggs, and ultimately die. 
I might state. that 80 per cent. of horses are infested with this 
parasite. 
LECTURE ON ۰ 
Bx tar Rev. W. J. EDDY. 
Delivered before the Geelong Field Naturalists’ Club. 
I anmosm laugh at the idea of giving a lecture on Alge! I can 
only hope, as an amateur, to give some information and offer 
some suggestions to any amateurs present, I cannot venture 
into such deep water in the study of Algw as that into which 
Mr. Tisdall is competent to take us, and into which he did take. 
us some months ago. “Little boats must keep near shore.” 
On the occasion referred to, Mr. Tisdall told us that all Sea- 
weeds are made up of cells with a neucleus, each cell being 
composed of three ingredients, gelatine, water and mineral salts,. 
the combination being a mass of protoplasm, 2.e., matter endowed 
"with life. He told us also that these cells contained as colour-.. 
ing matter, chlorophyl. He detailed the method of re-. 
production adopted by various classes of Sea-weeds; and ۰ 
explained that the system of classification depended upon ۰ 
three features,—1.— Cellular structure; 2.—Colour; and 3.— 
Method of re-production. He told us further that Alge have 
no true roots, stems or leaves, and that they differ from all other 
plants in deriving their nourishment through all parts of their. 
surface from the water in which they grow. My reason for 
recalling these thoughts is, that the way may thereby be made 
more plain for our simple study of Sea-weeds to-night. The 
study of Algæ is a section of Botany, but the Botanist generally 
confines his attention to the flowering and flowerless plants of the 
and, leaving to whosoever will, the study of the so-called 
“flowers of the sea." Not that all Alga grow in the sea, many 
grow in fresh water, some also on moist rocks or soil, others 
upon diseased animal tissue, and one species at least, appears 
to be formed in the human stomach. In all over 2000 species are 
known and have been described. We are interested to-night in 
Marine Alge—Sea-weeds, of which about 180 genera, and about 
450 species have been found on the Victorian coast. The late 
Mr. J. B. Wilson classified 176 genera with 427 species in his 
valuable catalogue. As far as I can discover no genus has been 
named after him, but 9 species bear his name, an honour he 
richly deserved, when it is remembered that he discovered 66 new 
