The mountains on which fort St. Frederic is built, as likewise those on which the above kinds of stone are found, consisted generally of a deep black lime-stone, lying in lamellæ as slates do, and it might be called a kind of slates, which can be turned into quicklime by fire[10]. This lime-stone is quite black in the inside, and, when broken, appears to be of an exceeding [[22]]fine texture. There are some grains of a dark spar scattered in it, which, together with some other inequalities, form veins in it. The strata which ly uppermost in the mountains consist of a grey lime-stone, which is seemingly no more than a variety of the preceding. The black lime-stone is constantly found filled with petrefactions of all kinds, and chiefly the following:
Pectinites, or petrefied Ostreæ Pectines. These petrefied shells were more abundant than any others that have been found here, and sometimes whole strata are met with, consisting merely of a quantity of shells of this sort, grown together. They are generally small, never exceeding an inch and a half in length. They are found in two different states of petrefaction; one shews always the impressions of the elevated and hollow surfaces of the shells, without any vestige of the shells themselves. In the other appears the real shell sticking in the stone, and by its light colour is easily distinguishable from the stone. Both these kinds are plentiful in the stone; however, the impressions are more in number than the real shells. Some of the shells are very elevated, especially in the middle, where they form as it were a hump; others again [[23]]are depressed in the middle; but in most of them the outward surface is remarkably elevated. The furrows always run longitudinally, or from the top, diverging to the margin.
Petrefied Cornua Ammonis. These are likewise frequently found, but not equal to the former in number: like the pectinitæ, they are found really petrefied, and in impressions; amongst them were some petrefied snails. Some of these Cornua Ammonis were remarkably big, and I do not remember seeing their equals, for they measured above two feet in diameter.
Different kinds of corals could be plainly seen in, and separated from, the stone in which they lay. Some were white and ramose, or Lithophytes; others were starry corals, or Madrepores; the latter were rather scarce.
I must give the name of Stone-balls to a kind of stones foreign to me, which are found in great plenty in some of the rock-stones. They were globular, one half of them projecting generally above the rock, and the other remaining in it. They consist of nearly parallel fibres, which arise from the bottom as from a center, and spread over the surface of the ball and have a grey colour. The outside of the balls is smooth, [[24]]but has a number of small pores, which externally appear to be covered with a pale grey crust. They are from an inch to an inch and a half in diameter.
Amongst some other kinds of sand, which are found on the shores of lake Champlain, two were very peculiar, and commonly lay in the same place; the one was black, and the other reddish brown, or granite coloured.
The black sand always lies uppermost, consists of very fine grains, which, when examined by a microscope, appear to have a dark blue colour, like that of a smooth iron, not attacked by rust. Some grains are roundish, but most of them angular, with shining surfaces; and they sparkle when the sun shines. All the grains of this sand without exception are attracted by the magnet. Amongst these black or deep blue grains, they meet with a few grains of a red or garnet coloured sand, which is the same with the red sand which lies immediately under it, and which I shall now describe. This red or garnet coloured sand is very fine, but not so fine as the black sand. Its grains not only participate of the colour of garnets, but they are really nothing but pounded garnets. Some grains are round, others angulated; all shine and [[25]]are semipellucid; but the magnet has no effect on them, and they do not sparkle so much in sunshine. This red sand is seldom found very pure, it being commonly mixed with a white sand, consisting of particles of quartz. The black and red sand is not found in every part of the shore, but only in a few places, in the order before mentioned. The uppermost or black sand lay about a quarter of an inch deep; when it was carefully taken off, the sand under it became of a deeper red the deeper it lay, and its depth was commonly greater than that of the former. When this was carefully taken away, the white sand of quartz appeared mixed very much at top with the red sand, but growing purer the deeper it lay. This white sand was above four inches deep, had round grains, which made it entirely like a pearl sand. Below this was a pale grey angulated quartz sand. In some places the garnet coloured sand lay uppermost, and this grey angulated one immediately under it, without a grain of either the black or the white sand.
I cannot determine the origin of the black or steel-coloured sand, for it was not known here whether there were iron mines in the neighbourhood or not. But I am rather inclined to believe they may be found [[26]]in these parts, as they are common in different parts of Canada, and as this sand is found on the shores of almost all the lakes, and rivers in Canada, though not in equal quantities. The red or garnet coloured sand has its origin hereabouts; for though the rocks near fort St. Frederic contained no garnets, yet there are stones of different sizes on the shores, quite different from the stones which form those rocks; these stones are very full of grains of garnets, and when pounded there is no perceptible difference between them and the red sand. In the more northerly parts of Canada, or below Quebec, the mountains themselves contain a great number of garnets. The garnet-coloured sand is very common on the shores of the river St. Lawrence. I shall leave out several observations which I made upon the minerals hereabouts, as uninteresting to most of my readers.
The Apocynum androsæmifolium grows in abundance on hills covered with trees, and is in full flower about this time; the French call it Herbe à la puce. When the stalk is cut or tore, a white milky juice comes out. The French attribute the same qualities to this plant, which the poison-tree, or Rhus vernix, has in the English colonies; that its poison is noxious to some [[27]]persons, and harmless to others. The milky juice, when spread upon the hands and body, has no bad effect on some persons; whereas others cannot come near it without being blistered. I saw a soldier whose hands were blistered all over, merely by plucking the plant, in order to shew it me; and it is said its exhalations affect some people, when they come within reach of them. It is generally allowed here, that the lactescent juice of this plant, when spread on any part of the human body not only swells the part, but frequently corrodes the skin; at least there are few examples of persons on whom it had no effect. As for my part, it has never hurt me, though in presence of several people I touched the plant, and rubbed my hands with the juice till they were white all over; and I have often rubbed the plant in my hands till it was quite crushed, without feeling the least inconvenience, or change on my hand. The cattle never touch this plant.
July the 12th. Burdock, or Arctium Lappa, grows in several places about the fort; and the governor told me, that its tender shoots are eaten in spring as raddishes, after the exterior peel is taken off.