Method of dejlroying TnfeSls. 169 



other function, in regard to one fpecies of mineral, it con- 

 tinued that function in all the varieties of that fpecies. 



The cryftals of rhomboidal iron are found among thofe 

 of the iron ore of the ifland of Elba. But it is very uncom- 

 mon for the law of decrement to attain to its boundary, and 

 for the rhomboid not to be modified by facets parallel to the 

 faces of the nucleus. 



If the decrement which produces the rhomboid took place 

 at the fame time on the eight folid angles of the cube, there 

 would refult from it a polyedron of 34 facets, all like the 

 trapezoidal granite, of which I ihall fpeak hereafter, but 

 with a very different ftructure. This refult is realifed by na- 

 ture in the cryftals found at the Calton-hill near Edinburgh, 

 which are considered as zeolites. 



[To be continued.] 



X. Method to dejlroy or drive away Earth-worms and various 

 other Infecls hurtful to Fields and Gardens, by M. So CO- 

 LO ff. From the New Transactions of the Imperial Aca- 

 demy of Sciences at Peteriburgh, Vol. V. 



T, 



HOUGH it is certain that earth-worms occafion great 

 deftruction by gnawing the tender roots of fhrubs and plants, 

 and that other infects, fuch as caterpillars and locufts, are 

 exceedingly hurtful both to fields and gardens, few have 

 given themfelves the trouble to devife any remedy for this 

 evil. I flatter myfelf, therefore, that I ihall do a fervice to 

 the public if I point out an eafy and fure method, certified by 

 experience, of either killing or driving away from fields and 

 gardens all noxious vermin. 



As the deftructive power of quick-lime, heightened by a 

 fixed alkali, which corrodes, diffolves and deftroys all the 

 tender parts of animals, has been long known, I thought 

 fcis mixture would be the beft means for accomplifhing the. 

 object I had in view. I took three parts, therefore, of quick- 

 lime 



