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 

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

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

 Peb. 21, 1667. 



Ml-. WfiAY to Mr. LiSTEE, at Burwell in Lincolnshire. 

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



Sententiam tuam de autoribus iis qui de Insectis 

 commentati sunt, in plerisque probo. Aristoteles quani- 

 vis egregius autor, confusus esse videtur ahquando et 

 obscurus, et in quamplurimis a scopo aberrat. Qui tamen 

 supersunt historise animalium libri non sunt integrum 

 Aristotelis de hac materia opus, C{mi Plinius (ni male 

 memini) quinquaginta voluminum meminit. De Aldro- 

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

 toni opere non admodum versatus sum ; video tamen 

 ilium ex antiquorum scriptis hausisse quicquid fere in 

 illud volmnen contulerit. In MoufFetum nimis iniquus 

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

 repub. literaria, et pleriq. viri docti mihi sufeagantm*. 

 Goedartium mihi nondum videre contigit. Kircheri ju- 

 dicium nihili facio ; an vero Insecta qusedam sponte 

 oriantur necne, determinare nequeo. Prseter hos qui de 

 insectis scripserunt, alicujus nominis aut pretii nuUos 

 novi: yidi ahquando in Siciha opus manuscriptum D. 

 Castelh Eomani in duos tomos divisum. Volumen satis 

 spissum et grande cum figuris propria ipsius manu deh- 

 neatis, quod nescio an unquam lucem publicam vism-um 

 sit. 



Londini. xiii Kal. Maii, 1668. 



