THIRD LECTURE. 17! 



dicam spectantium, vol. ix, p. 137. That these 

 hydatids were social vesicular worms, is suspected 

 with reason from the author's recital. Take his 

 own words : 



" Hydatidum majoribus ilia ovi gallinacei, mi- 

 noribus vero ilia pisi magaitudo inerat. Fluido 

 in iisdem coinprehenso, non prorsus fuerunt diduc- 

 tae, atque dilatatae. Majores ovali, minores autem 

 magis circulari forma erant instructae, tam vesicae 

 earundem, quam fluidum, valde clara erant et pel- 

 lucida. Hydatides sectae et fluidura in poculum 

 vitreura receptum, innumerabilera punctorum minu- 

 tissimorum i4i eo circumnatantium, fuscorum speci- 

 em referentium copiam osteuderunt, qui humore 

 aeri exposito dein evaporato, et parietibus et pocu- 

 li vitrei fuudo adhaeserunt. 



^^Quodfluidum neque omnino serosae, neque 

 omnino lymphaticae, fuit iudolis, et colore distinato 

 carens." 



(13) See^XXTII. 



( 14) The observation is reported by Dr. Pere- 

 loom, in his little work entitled, Descriptio et iconica 

 delineatio novi generis vermium stomachidae dictiy 

 etc. p, !34, I shall transcribe it in his own words, 

 because I deem it worthy of the greatest attention 

 of practitioners. 



^^ Olitor, quinquaginta fere aetatis, ante aliquot 

 tempus nephritide laborabat, ita ut periti judicarcnt 

 calculo vesicam occupatam esse, turn ex miclu do- 

 loroso, difficili, impcdito, et quocunque modo tur- 

 bato ; turn ex sensatione oneris in abdomine, titilla- 



