About nine miles above Fredericton the river suddenly widens and receives the Madam-Keswick. Here is a group of fertile islands, some of which are over a mile in length, and nearly as broad. At Fredericton the river is about three quarters of a mile wide, and flows with a beautiful unbroken current to the falls near the City of Saint John.--A number of fine Islands are scattered in different parts of its bed. These Islands are composed of rich alluvial soil, and produce large crops of grass and grain. Being formed by the washings of the river, they are like garden spots scattered through the country. About nine miles from St. John the river widens into a bay nearly six miles long and three wide. The river Kennebeckasis falls into this bay. At the foot of the bay it suddenly contracts, and winds through a crooked passage called the narrows, and again opens and forms a small bay directly above the falls. Here the current is again broken by a bed of rocks, and suddenly contracted by the near approach of the banks which appear to have been formerly united and forced asunder by some convulsion of nature. From the appearance of the rocks on each side it is probable that the water having been pent up in the small bay just noticed, have in their efforts to escape undermined the land and rocks at this place, and forced a subterraneous passage, which by wearing, aided by some violent concussion, has caused the rocks to fall in, when the earth being washed away by the rapidity of the current, has left the present passage open, and that the split-rock and the bed of the channel is part of the former overhanging rocks. For that the bed of the channel consists of cragged rocks of various shapes and sizes, is evident from the whirlpools and eddies at that place. These falls make a tremendous roaring at certain periods. After passing the falls, it forms the harbour of St. John, and falls into the Bay of Fundy in lat. 45 deg. 20' N. The spring tides at St. John rise from twenty-four to twenty-eight feet. The body of the river is seventeen and a half feet above low water mark. When the tide has flowed twelve feet, the falls are smooth and passable from fifteen to twenty minutes. They are level three and a half hours on the flood, and two and a half on the ebb, and passable four times in twenty-four hours. Above the falls the tides rise four feet. At Maugerville, seventy miles up the river, they rise from one to two feet; at Fredericton from six to ten inches, and are perceivable nine miles above that place, varying according to the phases of the moon. In the spring, the river, swoln with rains and the melting of the snow and ice, rises higher than the tides, which prevents vessels from ascending the falls for some weeks. RIVER MIRAMICHI.