326 



ORGANOGRAPHY. 



portion represents a flower; and the whole surmounted by 

 a crown of empty bracts. The Bread-fruit and Jack-fruit are 

 other examples of the porosis. The Bread-fruit has been 

 already alhidcd to, as affording an instance of a fruit which 

 grows most freely and becomes best adapted for food in propor- 



Fig. 706, 2. 



Fig. IQ'i 



Fig. 708. 



Fig. TOG, 2. Pine-apple fruit {Sorons), 

 surmounted by a crown of empty 



bracts. Fig. 707. Sorosis or fruit 



of the Mulberry {Mortis nigra) 



/'/(/. 70H. Fruit of the Raspberry 

 iliubus IikiMs), called an eta;rio. 



tion to the absence of seeds, and it thus presents a well-marked 

 exam])le of a departure from the ordinary character and condi- 

 tion of fruits. The Mulbcny (^g. 707) may be also cited as 

 another well-known fruit, whicli presents an example of a sorosis. 

 At first sight, the Mulberry appears to resemble the Raspbeny 

 (fig. 708), Blackberry, and other fruits derived from tiie genus 

 Buhus to whicli they belong, but in origin and structure 

 the latter are totally different. Thus as already noticed in 

 speaking of the Etrcrio, the Raspberry and other fruits derived 

 from the same genus, consist of a number of drupes or fleshy 

 acha-nia crowded together upon a dry thalamus, and are all the 

 produce of a single flower; but in the Mulberry, on the contrary, 

 each rounded portion of which the fruit is made up is derived 

 from a flower, the calyx of which has become succulent and 

 united to the ovary; the combination of a number of flowers in 

 this case therefore forms the fruit, while in the Raspberry, &c. it 

 is formed but by one flower. 



.*>. The Si/co»us is a collective fruit, formed of an enlarged 

 and more or less succulent receptacle, which hears a number 

 of sej)aratc flowers. The Fig (Jig, 383) is an examjtle of a 



