PREFACE. xv 



contrivances they have for avoiding dan- 

 gers and catching their prey. 



In fhells, not to negleft the number 

 of them belonging to one animal when 

 fingle, the turn in the windings, whether 

 to the right or left ; the ftripes,^ fpots, 

 bands, knobs, fpines, furrows and other 

 marks ; fhape of the mouth or opening 

 of the fhell, lips and beaks : In thofe 

 that have two or more valves, their equal 

 or different fizes ; the form of the hinges 

 where they are conne&ed, and the num- 

 ber of indentures tallying together ; the 

 ftripes and furrows on the outfides, and 

 whether longitudinal or tranfverfal ; and 

 the animals inhabiting the fhells Ihould 

 likewife be obferved and delineated. 



In the reft of the worm tribe, the fhape, 

 arms, and other parts of the animal Ihould 

 be delineated. 



In plants the greateft accuracy is re- 

 quifite, the fhape of the flower being fo 

 varied, nice attention is neceffary to di- 

 ftinguifh its minute parts ; the figure and 

 number of the flower leaves ; the form 

 and fe&ions of the flower-cup ; the num- 

 ber and difpofition of the duft velfels, and 

 of the columnar veffels {landing on the 

 fruftification (which are reckoned by bo- 

 tanifts to be the male and female parts of 

 the flower, and in fome inftances are on 

 different plants ; in others on the fame 



plant, 



