The Preface. 



ufe and improvement of all men, On^ 



ly in fome places ^ and chiefly in the 



'Third Chapter^ we have taken in the 



help of Glajfes 5 wherein^ after we 



had finiped the whole Compofnre^ 



fome Obfervations made by that 



Ingenious and Learned Ferjon 



Mr. Hookj a Worthy Member of the 



Royal Society^ my much Honoured 



Friend^ and by him communicated to 



me^ were fuper-^added : As likewife 



fome others alfo Microfcopical 5 of 



my own^ which his gave me the occa-^ 



flon of makings 



Thofe that fjall thinks fit to exa- 

 mine^ as well as to peruje thefe Ob- 

 fervationsy we advtrtife tkem^ Firft. 

 That they begin^ andfo proceed till 

 they end again ^, with the Seed : for 

 they Will hardly he able to avoids Er^ 

 ro'tir and /yfjfapprehcnfion^ if either 

 partial or prepoferous in their En- 

 (juiries. Next 5 That they confine 

 a not 



