MEMOIR OF PALLAS, 21 
and physics, and also improved his acquaintance 
with mineralogy, in the environs of that city. 
In the spring of the year 1759 young Pallas 
removed to Gottingen ; and though prevented by a 
long and dangerous illness from prosecuting his 
studies with his wonted ardour, yet he reaped much 
benefit from the instructions of the physicians Roe- 
derer and Vcegel, and improved his general know- 
ledge by diligently availing himself of the many 
rare books belonging to the library. During his resi- 
dence at this celebrated university, he made numer- 
ous experiments on poisons and the effects of the 
most potent medicines, applied himself to the dis- 
section of animals, and made many observations on 
worms. On the last named subject, he at this time 
composed an ingenious treatise under the title “* De 
infestis Viventibus intra viventia,’* in which he seems 
to have taken great pains to discriminate these noxi- 
ous animals, and to have described many of them 
with singular accuracy. . 
In July 1760 Pallas was attracted to the univer- 
sity of Leyden by the fame of its celebrated profes- 
sors, Albinus, Gaubius, and Muschenbroeck ; and 
by them he was noticed as a young man of pro- 
mising genius and indefatigable application. In 
December he took his Doctor's degree, and distin- 
guished himself by his inaugural dissertation, in 
which he defended by new experiments, the treatise 
* See list in the Appendix, where we have given as com- 
plete an enumeration as we could of the titles of his works, 
chronologically arranged. 
