130 AN INTRODUCTION 



five-cornered, &c. ; when four or five prominent 

 angles lie round the disk. 



Deltoid, shaped like a Delta*; when the figure 

 is a Rhombus ; that is, having four angles, of which 

 the two lateral ones are less distant from the centre 

 than those at the extremities. 



Rotund, round ; when it has no angles. 

 SINUS, a hollow, is a term used to express those 

 openings or cavities in leaves which distinguish them 

 into parts : In respect to these, leaves are said to be, 

 Reniform, kidney-shaped ; when they are roundish, 

 and hollowed at the base, without any angle. 



Cordiform, heart-shaped ; when they are ovate, 

 and hollowed at the base, and the hinder or lower 

 part has no angles. 



Lunulate, moon-shaped ; when they are round, 

 and hollowed at the base, and are furnished with 

 angles at the lower part. 



Sagittate, arrow-shaped, when they are triangu- 

 lar, hollowed at the base, and are furnished with 

 angles at the lower part. 



Hastate, javelin-shaped ; when they are triangular, 



the base and sides hollowed, and the angles spreading. 



Panduraeform, pandure-shaped 'f ; when they are 



oblong, broader above than below, and contracted 



in the sides. 



Fissa, cloven ; when they are divided by linear 

 sinusses, and have their margins straight ; and from 

 the number of such divisions they are called Bifid, 

 Trifid, Quadrifid, Multifid, &c. cut into two, three, 

 four, five, or many segments. 



* A Greek letter so called. The figure of the Delta is a 

 triangle, which does not exactly answer to the character here 

 given of a deltoid leaf. 



f A musical instrument of the lute kind, but now disused : 

 The shape of it, as given by Mersennus, Harm. Instr. b. 1. 

 does not answer to that of the leaves here explained : the fi- 

 gure of which comes nearer to that of the body of the Violon- 

 cello or Violin. 





