78 XGlices respecting Xcw Booh. 



ing it is by dissolving the platina in nitrous acid, to \vliic!i^ 

 for that purpose, two parts ot" muriate of soda and one of 

 platina arc added. The platina must be made in a retort 

 with its receiver ; and after about four fifths of the fluid 

 have come over, the process must be interrupted, and the 

 whole left t» cool in the sand bath. The salt crystallizes 

 in fine prisms, which are sometimes four or five inches 

 long, and either red brown, like titanium, yellow, like 

 amber, or of a beautiful coquclicot colour, according to the 

 purity of the platina. I enclose here my address during 

 my absence, and hope you will receive with indulgence the 

 contents of this letter. 



I am with great regard, sir. 

 Your most humble and obedient servant. 



Count Apollos Moussin Poushkin. 



T, 



XII. Notices respecting New Books. 



HE phvsicians of the original Vaccine Pock Institution, 

 established in 1799, have lately pul)]ished " A Statement 

 of Euidence from. Trials ly Inoculntion nf Jhriolou^ and 

 f'accine JMatter ; to judge of the Question, JVhether or not 

 a Person can undergo the Small- Po.r after being ajftcted ly 

 the Cow- Pock," which is well deserving the attention of 

 medical men. The chief object of tlie authors seems to 

 have been to answer, by decisive experiments, the objec- 

 tions of Mr. Goklson, in a recent publication, questioning 

 the eflicaev of vaccine inoculation; and they have taken 

 the best means to ascertain the question, namely, re-in- 

 oculating, with variolous matter, a number of patients who 

 had some \ears ago, been inoculated for the cow-pock. The 

 experiments related show, that above fifty persons who 

 had been vaccinated from three to five years ago, and ten 

 who had been vaccinated at a later period, w'erc incapable of 

 taking the small-pox by inoculation in circumstances chosen 

 as most favourable for infection. For many of the sub- 

 jects were exposed to the effluvia from small-pox patients; 

 tl'.cy were all inoculated in three times the usual number of 

 places ; they were all inoculated with eHicacious and recent 

 C)atter; and with many of them unusual pains were bestowed 

 to introduce the matter quite fluid immediately from the 

 variolous palient. In these it seems fair to calculate that 

 not more than one, or at most two, of these sixty persons 

 wuold have escaped the small-pox, if thi.-\- had not already 



gone 



