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The Rowley Hills in Staffordshire, commonly known as Rowley Ragstone, are melaphyre. This name has usually been extended to all granular mixtures, whether of hornblende and feldspar, or of augite and feldspar. The term DIORITE has been applied exclusively to compounds of hornblende and triclinic feldspar.
There is this difficulty further to contend with: that some of the most poisonous of substances are of unstable composition and are readily altered by chemical reagents; to this group belong many vegetable and most animal poisons. These, therefore, must be treated differently from the more stable inorganic compounds.
Young students in chemistry, when they learn that nitrogen is distinguished by the weakness of its affinities for other elements, and its consequent great inertness as a chemical agent, are often astonished to find that its compounds such as nitric acid, nitre, which gives its explosive character to gunpowder, nitro-glycerine, gun-cotton, and various other explosive substances which it helps to form are among the most remarkable in nature for the violence and intensity of their action, and for the extent to which the principle of vitality avails itself of them as magazines of force, upon which to draw in the fulfillment of its various functions.
"But the cook is my favourite. He is a scientific man, and so skilful in compounds, he generally goes by the name of doctor. I like the daily consultation with him about dinner: not that I am an epicure; but at sea, as the business of life is eating, it is as well to be master of one's calling.
These are necessary trace elements. Why should you not concede that here there are trace elements or trace compounds needed " "You want me to report that," said Calhoun, flatly. "I couldn't do it without explaining a number of things. Paras are madmen, but they organize. A symptom of privation is violent yawning. This ... condition appeared only six months ago.
One can fairly sniff fever and ague in the streets. Much taste is displayed in architectural matters by the wealthier residents. The walls surrounding the little compounds are sometimes adorned with house-leeks or cactus, tastefully set out along the top; and, in other cases, with ornamental tiles.
Are we to regard it as Tyndall did, and as others before and since his time did and do, as potential in the constitution of matter, and self-evolved, like the chemical compounds that are involved in its processes?
In that quarter, too, there were barracks, with compounds and open-fronted booths, where slaves were exposed for sale; and there, also, were the caravanserais within whose walls the kneeling camels grumbled and the blossomy spring air grew fetid with the reek of dung. There was a market-place for elephants and other oriental beasts.
The Kinds, therefore, which are called in chemistry simple substances, or elementary natural agents, are the only ones, any of whose properties can with certainty be considered ultimate; and of these the ultimate properties are probably much more numerous than we at present recognize, since every successful instance of the resolution of the properties of their compounds into simpler laws, generally leads to the recognition of properties in the elements distinct from any previously known.
It is amusing to see the puzzled expression of countenance of some Swiss student who takes his notes in French, when one of those long German compounds, involving some bold figure of speech, is uttered. What circumlocutions must he not use, if he wish to give the full force of the idea! A real abuse, however, is the perpetual dictation-system still used by some.
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