24 CORRESPONDENCE OF RAY. 



Hooke hath to that added a circular motion ; the weight 

 at the end of one vibration is turned off by a kind of a 

 spring, which makes the motion circular. The most 

 considerable experiment yesterday, was the weighing of 

 1st, tin ; 2d, copper ; 3d, tin and copper equally mixed 

 together : these three severally were of the same weight 

 in the air, but in water the mixed metal weighed much 

 lighter than the other two. A new book of Dr. H. Moor 

 is come out, which he calls ' Enchiridion Ethicum.' 

 Feb. 21, 16G7. 



Mr. WKAY to Mr. LISTER, at Burwell in Lincolnsliire. 

 Jo. Wray D. Martino Lister, suo S. D. 



SENTENTIAM tuam de autoribus iis qui de Insectis 

 commentati sunt, in plerisque probo. Aristoteles quam- 

 vis egregius autor, confusus esse videtur aliquando et 

 obscurus, et in quamplurimis a scopo aberrat. Qui tamcn 

 supersunt historic animalium libri non sunt integruin 

 Aristotelis de hac materia opus. Cum Plinius (ni male 

 memini) quinquaginta voluminum meminit. De Aldro- 

 vando, Alberto, Cardano, juxta tecuni sentio. In Wot- 

 toni opere non admodum versatus sum; video tamen 

 ilium ex antiquorum scriptis hausisse quicquid fere in 

 illud volumen contulerit. In Mouffetum nimis iniquus 

 videris: nam et ille, me judice, non male meruit de 

 repub. literaria, et pleriq. viri docti mihi suffragantur. 

 Goedartium mihi nondum videre contigit. Kircheri ju- 

 dicium nihih facio ; an vero Insecta quasdam sponte 

 oriantur necne, determinare nequeo. Prseter hos qui de 

 insectis scripserunt, alicujus nominis aut pretii nullos 

 novi: vidi ahquando in Sicilia opus manuscriptum D. 

 Castelli Romani in duos tomos divisum. Volumen satis 

 spissum et grande cum figuris propria ipsius manu deli- 

 neatis, quod nescio an unquam lucem publicain visurum 

 sit. 



Londiiii. xiii Kal. Mali, 1668. 



