Respiration, Digestion, and Fermentation. 109 



ascertain exact location of nectarial organs. A large number 

 will be found in floral structures. \\'ell-developed nectaries 

 may be found outside the floral circles in Passiflora, Cassia, 

 Ricinus, and many species grown in conservatories. Make 

 an examination of the structure of the nectaries. Draw a 

 section made at right angles to the secreting surface, and note 

 structure of 

 secreting 

 cells. Ascer- 

 tain rate of 

 secretion by 

 removing the 

 nectar from a 

 gland and 

 noting length 

 of time neces- 

 sary for its re- 

 pl ac e ment. 

 Carefully re- 

 move the nec- 

 t a r from 

 another gland, 

 and then wash 

 well with dis- 

 tilled water, 

 and wipe dry 

 by means of 

 a minute por- 

 tion of linen cloth, 

 secretion ? 



118. Action of glandular hairs — Examine the glandu- 

 lar hairs of the pansy [Fio/a tricolor^, horse-chestnut {yEscii- 

 ii/s). Primula Sinensis, hop i^Humulus lupuius), and note struc- 

 ture of the glandular organ, and make various tests, including 



Fig, 79. — Diagram of flower of Narcissus. «/, nectary ; 

 excreted nectar. After Schniewind-Tliies. 



What effect does it have on the rate of 



