A botanist will br* ably be able to tell us, approximately 1£» many gallons of water per day eaS these giant willows,with its beautiful green streamers, win Sim through its sponge-Hko roots darhjtfo. summer months, when the growth oferi tiny shoot may be marked from diti day. Multiply this quantity by the & sandsof trees fringlngthe rfver.anddS the result from the total number oj«i lons discharged per diem by the epriusw the head of the river and its prffl afßuente—(this could readily be epa*? mately ascertained}—and I ventotet think the result would leave us wtoaijy that the river does not ran dry altoSS before it can reach the Stanmore br%nji 1 must be remembered also that luk ' under the city and suburbs wsf* according to the report of Mr Wffi Clark, C.E. (who is Rurely a compefej authority), of "An irregulareuceesasaij beds of clay, sand and gravel aesasl* filled with water." No doubt, wires &m was no vegetation in or near the city $ sufficient size to send down its rooteisis those beds, the water found ira«» through them in a steady course toffsks the sea. Bat now that thousands of fm of all kinds are growing over this tmui sending their roots down into thosta && of sand and gravel, they mast draw & great portion of their nourlehraeofc tm the water described by Mr Clark as fiSfe those beds, and the water so drawa atij will naturally be replaced by other tnjjjir percolating through those oeds iremtis river. If this theory of mine ts CGHS, although dredging the river will mm the mnd and silt which has !ws deposited during thirty years, the cffeot can only be to cause the stream to within still narrower limits, reodsfejiS quite useless for boating purposes, T& erection of more dams at different psfei might improve its appearance, andraik it more convenient for boating; but in tie face of Mr Clark's report—in consetaw of which something lite £200,000 ess, I believe, been expended in provides drainage system—it would surely basssS prejudicial to the best interest?} of ik community as a whole to adopt wsk & course. In furtherance of tny vkmo3 this point, X take the liberty of qm&igk « full sections 0, 10. end 11 of MrtMstt- 1 port made in 1878. 