190(;.] PUBLIC IHKTMKXT — No. ;;3. 1 i;i 



su][)liur wash spray reconimoiKlecl hy Prof. R. E. Smith, 

 formerly of this sliition. This mixture, which consists of 

 sul[)hui-, soaj), i)otiish and water, possesses rcinarkal)k^ stick- 

 ing quaUties, and it is undoubtedly the most efficient mix- 

 ture recommended for s})ra3'ing for asparagus rust. 



An Ari'LiCATiox of the Coppeu Sulfate Treatment. 



Early in the summer the college pond became so overrun 

 with Algje as to be unsightly, and the smell of this decay- 

 ing vegetable matter was so unpleasant that it became neces- 

 sary to treat it. 



Microscopic examinations of the water showed that it 

 contained a considerable amount of short suspended fila- 

 ments, of a slightly whitish or greenish color, which proved 

 to be Anahmna flos-aqum, a form of Alga? found frequently 

 in pul)lic water supplies, and which gives rise to consider- 

 able trouble. The water content of the pond was roughly 

 determined, and then treated with 1 part of co[)per sulfate 

 to 4,000,000 })arts of water. The required amount of coi)per 

 sulfate was placed in a loosely woven sack and hung over 

 the stern of a canoe, which was paddled around the pond in 

 concentric circles for about one-half an hour, when all the 

 coi)per sulfate was dissolved. This is the method recom- 

 mended by Drs. Moore and Kcllerman in their work on 

 treating reservoirs with copper sulfate. A careful exami- 

 nation of samples taken twenty-four hours aft(>r treatment 

 showed a slight decrease in Anabmna, and in two or three 

 da^^s it had practicall}' disappeai'ed. 



Spirogi/ra, Avhich was present along the shores near the 

 inlet at the time of treatment, was not atfected, and subse- 

 quently a number of large clumps were found in a flourish- 

 ing condition in different parts of the pond, and many forms 

 of Alga;, such as Desmids and Diafanis, appeared not to be 

 in the least affected by the treatment. Neither did the 

 animal life seem to be affected in any Avay by the treatment, 

 as no ill effects could be noted on the fish, frogs, tadpoles or 

 other fauna inhabitin<y the water. 



Of the Protozoa, the Ceratimn was very numerous bt)th 

 before and after treatment, and was in no wise affected by 



