Sewage grown algae as a source of animal feed has a great possibility . For ensuring the maximum yield of algae a study of the algal flora of raw as well as stabilized sewage is an essential prerequisite.
The literature dealing with the type of algae encountered in sewage is scanty. Only a few attempts have been made in our country on the subject (RAMAN, 1960 ; JAYANGOUDAR & GANAPATI, 1963) . The present communication is a report on the algal flora and its seasonal variation, in raw and stabilized sewage, of the Medical College and Martyrs' Memorial sewage discharge spots in Lucknow city .
ALGAL SUCCESSION IN RAW SEWAGE
The periodicity and relative abundance of algal forms in raw sewage are shown in Table I .
The samples collected in August and September, 1966, from near Medical College, were dominated by Cyanophyta (Oscillatoria chalybea) and Euglenophyta (Astasia inflata f. fusiformis) . The raw sewage near Martyrs' Memorial, likewise, was found to dominate in O . chalybea, but Euglenophycean members were entirely absent .
In October, 1966, the algal flora did not change appreciably and O. chalybea continued as the dominant species .
An examination of samples collected in November, 1966, from Medical College sewage, showed profuse growth of Oscillatoria anguina, which masked the dominance of O . chalybea . The species