31 COMPOSITE ORGANS. CHAP. II. 



green, and in the seed-lobes white ; while in flowers 

 and fruit it assumes almost all varieties of shade 

 whatever, according to the species of plant, or cir- 

 cumstances in which it is placed. When viewed 

 Its appear- without the microscope its appearance is that of an 



ance under r , 



the mi- assemblae or small and minute ranules imbedded 



c P e - j n a gQft an( j glutinous substance, as in the greater 

 part of leaves and succulent fruits, in which last the 

 fracture often presents an appearance resembling 

 that of a piece of loaf sugar, as in the case of the 

 Apple and Pear. But when inspected minutely 

 with a good glass its structure is found to be very 

 different. 

 Asde- The first vegetable anatomists who investigated 



scribed by 



Malpighi the structure of the pulp were Malpighi and Grew. 

 " w " The former describes it minutely, and compares it 

 to an assemblage of inflated threads or bladders ; 

 the latter describes it under the appellation of the 

 Parenchyma, and compares it to the bubbles formed 

 upon the surface of liquor in a state of fermenta- 

 tion. Having examined it chiefly as it exists in the 

 seed and infant plant, he made a calculation, by 

 which it appeared to him to form at an average 

 three fiftieths of the plumelet, five seventieths of 

 the radicle, and three fourths of the cotyledons, 

 though it is in some species more, and in some less. 



By Du Du Hamel describes it under the appellation of 



JIainel. , M TIT i 



the cellular tissue, 1 believe, and represents it as 

 consisting of a number of longitudinal fibres di- 

 verging and uniting again continually, arid crossing 



