TENDRILS OF PLANTS. 3J 



working, as Indian ink is to lamp black, I do not mean to say 

 that it make* a clearer shadow ; but Indian ink dries much 

 quicker than sepia — an important consideration where a very 

 large pale shadow is wanted. If too, a mistake be made with 

 sepia, it may be washed almost clean off, whereas part of the 

 Indian ink, if once dry, will adhere to the paper and resist every 

 effort to remove it, without absolutely rubbing up the surface. 

 I could point out other differences between Indian ink and 

 sepia." 



To such artists as, by residing near the coast, have an op- Sepia drierf 

 portunity of procuring the cuttle fish from fishermen, I fxpo"ure to^ 

 would recommend the following simple means of preserving the air 

 the sepia.— After carefully taking the bag out of the fish, ]£* y J^ J^J* 

 having previously secured the duct by a ligature to prevent the 

 sepia from running out, empty the contents of it into a saucer - 

 or gallipot, and after spreading it round the sides of the vessel, 

 surfer it to dry gradually by exposure to the air. The reason for 

 only coating the sides of the vessel is in order that it may dry 

 before putrefaction commences. 



In this dry state it will keep for any length of time, and will 

 always be fit for use, by being rubbed up with a little water, 



GROVER KEMP. 



Brighton, 11 Mo. 26, 1812. 



VIII. 



On the Motions of the Tendrils of Plants. By Thomas An- 

 drew Knight, Esq. F. R. S. From the Philosophical 

 Transactions for 1812. 



THE motions of the tendrils of plants, and the efforts they Thetendrlls of 

 apparently make to approach and attach themselves to con- P {an *shave 

 tiguous objects, have been supposed by many naturalists to to move P from 

 originate in some degrees of sensation and perception : and sensation and 

 though other naturalists have rejected this hypothesis, few, or perce P tu 

 no experiments have been made by them to ascertain with 

 what propriety the various motions of tendrils, of different 

 kinds, can be attributed to peculiarity of organization, and the 

 operation of external causes. I was consequently induced, 

 during the last summer, to employ a considerable portion of 



time 



