524 Account of Booh, ^c. 



SherrifF of Deptford; one from Mr. Houften of London; three from Dr. Pearfon of St. 

 George's Hofpital, with remarks; one from Dr. Marlhall, with the difleftion; one from Dr. 

 Willan; and one from Mr. Thomas of Leicefter-fquare, with the difleftion. 



Dr. Rollo informs us, that, fmce the firft difperfion of his notes on Capt. Meredith's cafe, 

 in Jan. 1 797, the number of diabetic patients, which he has either feen or heard of, amounts 

 in all to 48 ; a circumftance which proves, that this complaint has been frequently overlooked, 

 and is by no means fo rare as has been generally fuppofed. At the end of the firft part are 

 fome experiments and obfervations on urine and fugar, by Mr. Cruickfliank. 



In the fecond part, we find a continuation of the trials of the nitrous acid, and other oxy- 

 genating remedies, in the lues venerea; which appear to eftablifh their efficacy in this 

 difcafe, both in its primary, and fecondai-y ftages. The number of cafes cured in this way, 

 fince March 1797, amount to 155; of thefe, 59 were cured by the nitrous acid; 59 by the 

 oxygenated muriate of pot-afli; 7 by the oxygenated muriatic acid, and muriate of man- 

 ganefe; 3 by lemon juice; 1 1 by the nitrous and other acids, combined with the oxygenated 

 muriate of pot-afli; and 16 by a combination of mercury, with the new remedies. 



In a few inftances, where tliefe medicines had not been continued for a fufficient length of 

 time, relapfes occurred, and the fecondary fymptoms made their appearance; but all thefe 

 were afterwards completely cured, by perfcvering in the fame mode of treatment. 



At the conclufion of this part are fome ufeful and neceflary obfervations, with re- 

 gard to the management of thefe remedies, more efpecially the oxymuriate of pot-a(h : but 

 for particulars, the reader muft refer to the work itfelf; of the charafter and importance of 

 which, the public is fufficicntly aware. 



Moyens d'apprendre a compter furement et avec facilite, ouvrage pofthume de Con- 

 dorcet ; or. Methods of learning Accounts with certainty and eafe. One volume, 8vo. 

 132 pages. Sold by Maulardier at Paris, year vii. 



The diftinguifhing chara£ler of thefe elements, fays the editor, are, that they exhibit the 

 elements of arithmetic and logic at the fame time. The author ufes the decimal fyftem. 

 Mag. Encycl. ^ 



Mr. Lowry, engraver, of Titchfield-ftreet, the artift alluded to at page 429 of the prefent 

 volume, has fhewn me his machine for ruling, which is very different from mine, in all its 

 parts. As he has no adtual divifion in the part which produces the fhift, he can regulate his 

 diftances to incommenfurate, as well as commenfurate, meafures. The parallax of the rul- 

 ing point, againft which I had made no provifion, is, by a very fimple and happy contriv- 

 ance, taken away in common ruling, or rendered variable at pleafure, for the purpofe of 

 thickening the ftroke in Ihading. This, together with his great profelfional (kill and fcience, 

 has given Mr. Lowry's engravings the degree of precifion and efFeft for which they are fo 

 juftly admired. 



In July 1786, 1 communicated to the celebrated Mr. Troughton, of Fleet-ftreet, a fmall 

 apparatus, for fecuring the point from lateral deviation, in dividing mathematical inftruments, 

 which I did not think neceflary to add to the inftrument in plate 20. — The execution of that 

 plate, in which the point wae left to the ufual management of the artift, fhews, however, 

 that fuch a contrivance is neceflary, and I fliall take an opportunity of defcribing it hereafter. 



