On Crystallography. 2S9 



following is the case alluded to : *' A man about 50 years 

 of age, and who had lived irregularly, had been for several 

 years afflicted with ulcers on both legs. They at last ex- 

 tended from the knee to the ankle downwards, the dis- 

 charge being greater and the sores worse-conditioned along 

 the shin-bone in front of the leg. When the writer of 

 this article first saw the man in question he was confined 

 to bed, and had been unable to walk across the rpom for 

 several weeks : he had been successively attended by all 

 the medical gentlemen of the (own in which he lived, and 

 had undergone several courses of medicine with a view- 

 to purify the system, but without effect : l)is sores were 

 dressed with the usual ointments. The application of tur- 

 nip poultices was suggested to him by a country woman 

 who came into the town on market-days. Her instructions 

 were, that he should night and morning apply poultices of 

 white turnips to (he soics, previously bathing them with 

 the liquor, squeezed out when the roots were boiled into 

 pulp. The poultices were directed to be applied hot. The 

 above directions were faithfully attended to by the patient 

 under the inspection of the writer of this article : within 

 the first twenty-four hours the ulcers had assumed a diffe- 

 rent appearance, and in about a wttk from the first appli- 

 cation of the turnips, the ulcers were so far healed that the 

 man was able to walk out. In a few days afterwards the 

 sores entirely disappeared, and the skin soon r^sun)ed its 

 usual apjiearance. During this period no medicine was 

 taken bv the patient; the state of his bowels not even re- 

 quiring a dose of salts." 



XLI. On Crystallography. By M. Hauy. Translated 

 from the la^t Paris Edition of Ids Traite de Mineralogic. 



[Continued from p. 226.] 



JVlrxED Dr.CRKMENTS. — Decrements are so called in 

 which the numbers of ranges subtracted in breadth and 

 heiuht give ratios, the two terms of which ^^xceed unity. 

 Such are tlie decrements winch take place by tivo ranges in 

 breadth and by three ranges in height, or by three ranges 

 in breadth and two in height, &:c. We see that their the- 

 ory may be easily referred to that of decrements in which 

 there is only a single range subtracted in one of the two di- 

 rections. 



Inteumediate DiiCRKMENTS.— Wc have seen that in 

 the case of a decrement by one range round one and the 



Vol. 31. No. 138. October I&09. T same 



