NIARL.
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Is a compound calcareous earth, found in most parts of the world, and has been exten- sively used throughout this kingdom, where 1t is supposed to have been known to hus- bandmen, at very early period of our his tory. There are, indeed, leases on record, granted in the reigns of'Edward I. and H., which compel the tenants to make use of it ]; but, though still employed, it has been in great degree superseded by the more recent introduction of lime, of the properties of which 1t in some measure partakes. The term denoting 1t was formerly used in very vague sense, for 1t is a substance consisting of various materials, and it has consequently happened, that what has been supposed to ap- ply to one species, did not hold good when affirmed of another Although principally deemed valuable on account of the calcareous matter which il usually contains, still its com position differs so essentially, that its inhu- enee as manure is but imperlectly understood :; yet theorehc writings abound in general direc- tions for its use, which are frequently found not to answer in practice; for their rules are drawn either from statements which have been made of the effects of its application on particular soils, or from analyses of its quali- tiCS- w illtHs uS tltSt Ndif III lll- stances, frequently lead farmers astray. Its real value can, therefore, be only ascertained through the practical experience of those who have either actually tried its efficacy, or who have witnessed it in their own neghbor- hood.

 This ignorance of the distinguishing pro- perties of mari, has necessarily led to many mistakes in it's application, which have occa- stoned the variety of opinions that are enter tained regarding its use. In most places where it was anciently employed, and where its iertllizing influence was discovered to be keminently great, it was thought by many l farmers that it could be made to supersede the use of dung; they, therefore, in many in- stances, sold theirvhay and straw, and al- though, notwithstanding this reduction of the quantity of putreseent manure, they still for a time obtained large crops, yet, eventually, the chemical effects of the mari exhausted the land. No second marling could operate upon It, until 1t had been renovated by repeated ap- phcations of dung; and thus has arisen the old saying, cited by Barnaby Googe, who wrote so long ago as the middle of the six teenth century, that lime aad mari are good tor the .father, but bad for Me son. In this manner also, some valuable discoveries in agriculture have fallen into disuse, through their mistaken application, when governed by local circumstances which were i'll under stood. Wherever mari, of kind adapted to the soil, has been applied, and that a judicious system of culture has been pursued, without either over-cropping, or neglectng the use of putrescent manure, the proverb is so far from